Now that you’ve learned all there is to know from our Glock 19 gen 4 review, let’s focus our attention on another favorite of mine. I don’t always spend lots of time at the range, but when I do I have my Glock 17 with me. It is my carrying gun. The Glock 19 remains in a safe at home, but I usually train with the 17.
The Glock 17 is one of the most widely-used handguns in the world, and it continues to be the weapon of choice for first-timers as well as veteran shooters. Professionals are also very fond of the Glock, and it can be seen competing in a wide range of events all over the world.
The Man Who Started It All: Gaston Glock
Glock KG was founded in 1963 by an engineer named Gaston Glock. The company, based in Austria, produced steel and plastic parts. In the 70’s, Glock began producing knives, training grenades, and other products for the Austrian military.
The connections Glock formed with the military led to new opportunities. In 1980, Glock KG received a formal invitation from the Austrian military to develop a new service sidearm. The army wanted to replace their older WWII models, and wanted the company to be involved.
Gaston Glock did not have any firearm experience whatsoever, but he nevertheless accepted the invitation, and set out to create a new handgun for the Austrian military.
Glock put together a team in order to pinpoint traits and qualities which would make up the perfect gun. A few months later, Glock had developed a prototype. The company submitted the semi-automatic model no. 17, so named because it was Glock’s 17th patent, to the approval and scrutiny of the Ministry’s various committees. The tests which the competing guns underwent were harsh and very demanding. Eventually, the Austrian Ministry of Defense decided to pick up Glock’s option, and the model 17 became Austria’s service handgun. The Glock came in first, beating local and international companies who were also competing for the contract.
Austrian military and police began carrying Glock 17 firearms in 1982, and following that the brand had expanded worldwide. Soon after the Glock made its appearance, the Norwegian and Swedish armed forces began carrying it as well. The Glock 17’s popularity grew, and in 1984 NATO took it in as well, making it a standard firearm and giving it a NATO stock number.
Glock’s main offices are in Austria, but they also have offices in the United States, Uruguay, Hong Kong, and the United Arab Emirates.
Glock Generations
Over the years, the Glock 17 went through different releases. These were nicknamed “generations” by Glock users, and the name stuck. The company itself has since adopted the term as well, and released its latest Glock 17 as “Gen 4”.
A short timeline:
1982 – Glock produces the Glock model number 17. It has smooth grips on the front and back straps. There is texture on the handle. This is the basis of the Glock, which has remained pretty constant. This is the model known as Gen 1.
1988 – The Gen 2 is produced. One major change is that the recoil spring is one piece, as opposed to the spring on the Gen 1. The grip is also different, since Glock added checkering to the front and back panels.
1996 – The Gen 3 comes along, and it sports some very visible changes – accessory rail, finger grooves, and thumb rest, to name a few. In my opinion, the Gen 3 is a very comfortable gun to hold. Internally, the Glock 17’s mechanism has a few differences, too. There is a smaller magazine-release button, but after training with it, it becomes a very natural gun to work with. This is my personal favorite, which is why it is the one that I carry.
2010 – Gen 4 is released, with the company actually writing Gen 4 on the gun’s slide. The parts of earlier Glock 17 models (Gen 1, 2 and 3) were completely interchangeable, but that is not the case with the Gen 4. Only some of the Glock 17 Gen 4’s parts are interchangeable.
Two main things were different about the Gen 4: First, ergonomics. Second, the recoil system.
Ergonomically, the Gen 4 was a step up. First off, Glock provides multiple, interchangeable back straps along with the gun. Second, the company reduced the gun’s grip. Third, there is a larger magazine release button. The larger magazine release means that a shooter doesn’t need to change the grip in order to change magazines, and that is a huge advantage. Furthermore, the button can be switched from left to right. This ambidextrous design accommodates different shooters.
The magazine release button also caused the magazines themselves to be different, and with the Gen 4 the magazines have an extra cutout, which make them ambidextrous as well. A shooter can still opt to use older Gen magazines. The Gen 4 magazines will fit any older generation, so there is no problem there.
These ergonomic differences allow the Glock 17 to fit many different types of hands. The texturing on the gun also changed with the Gen 4’s release, and it took on a different look and feel. It wasn’t the first time that a textured handle was introduced, but unlike the Gen 2 and Gen 3’s sandpaper-like surface or pyramid-looking grips, the Gen 4 has a smoother texturing.
This smoother texturing can be found on the back straps and also in the finger grooves. There is also some special texturing on the front of the trigger guard.
The Gen 4 grips are much better than the Gen 3, and this was a smart move on Glock’s part. It shows just how attentive they are to their customers, and that is no small thing. Ultimately, it is what makes any business work.
As for the recoil system: Gen 4 pistols were equipped with dual recoil springs. In September 2011, Glock initiated a spring exchange program at no extra cost to the customer. According to Glock, the company did this in order to ensure that the Gen 4 was up to standards. In other words, there was a kind of recall. The dual recoil spring was meant to help with recoil, and to improve the life of the gun. The dual recoil springs mean that there is less recoil, and that the muzzle climb is also lessened. This contributes to faster target acquisition, and in a crunch this could mean the difference between life and death.
Dual recoils are also available for the previous Gens, but they became standard with the Gen 4. The dual recoil spring system meant that the Gen 4 came with some changes to the rail system and the frame. Even before the dual recoil spring was used with the Glock 17, Glock was using it with its subcompact handguns, like the Glock 26 and 36.
Gun Safety
As for the Glock’s safety, this has been one of the gun’s advantages from the beginning. The Glock 17 has three safety mechanisms, and they are all related to the trigger. This is why the Glock was introduced as a “safe action” pistol. Two safety features are internal, and one is external.
First, there is an external trigger safety. The trigger safety prevents inadvertent firing, and – once the trigger has been pulled – releasing it automatically reactivates the safety.
Second, the Glock has an internal firing pin safety. Glock 17 is striker-fired, and the pin safety prevents accidental discharges.
Third, there is an internal drop safety feature. Part of the tests which the guns undergo have to do with dropping them from various heights. The guns are repeatedly dropped, to test their reliability.
Watch this video on YouTube
Glock is simplicity. “Less is more” is a rule of thumb which can be applied in many situations. Firearms are no different. The more parts there are, the more there is that may go wrong with the gun. The Glock 17 has only 35 parts, and that means that it is easy to take apart and easy to reassemble. A field stripping will take seconds (after some training), and that is saying a lot. Furthermore, because there are not many pieces to handle, Glock parts can be switched and modified with greater ease.
The Glock 17 has only two external functions – the slide release and the magazine release. That’s it. Simple. And I happen to love that about this gun. Later generation Glock 17’s are treated with tenifer on the slide, and so they are very resistant to scratches, corrosion, and wear.
Parts and Treatments
Many of the Glock’s parts are made of high strength polymer based on nylon. The rest of the gun is made of steel. The polymer (called polymer-2) in the gun is an invention of Gaston Glock himself. The substance was very unconventional when it was first introduced. Over time, it became clear that Glock knew what he was doing when the company released this new and revolutionary handgun.
Polymer-2 is a substance which is, first and foremost, resistant. It is more resilient than many different steel alloys. This substance can withstand very hot temperatures, shock, and different liquids.
The Glock’s slide is made of a single block of steel, which is made using advanced CNC technology. The barrel and slide are hardened twice, to make sure that they are of the best quality. After that, the slide and barrel are subjected to a tenifer treatment. Tenifer is a substance that is also extremely resistant, and it is a standard in the weapons industry. After the treatment is complete, the gun has a matte gray kind of look to its surface, and that is when a Parkerized finish is applied to the handgun, to give it its final look.
The tenifer treatment helps to protect the steel parts which are inside. What that means is that even if the finish were to wear off, the tenifer-treated parts would still be protected. Tenifer is even effective up to a certain depth below the surface, so you can technically (and practically, for that matter) fire this weapon under water.
Ammo
Okay, let’s talk ammo. Full metal jacket or hollow point cartridges are okay, but Glock itself recommends that owners do not use reloaded ammo in the Glock’s barrels. Reloaded ammo is treated differently, and only certain barrels can withstand its power. In truth, the barrel of a Glock 17 could most likely take any kind of 9mm ammo and continue firing. However, it is best to adhere to the company’s suggestions. After all, they are the ones who made the gun.
And as long as we are discussing ammo, let’s bring the magazine into the picture. The Glock 17 Gen 4 comes with 3 factory-made, 17-round polymer magazines. The other Gens come with 2 magazines in their case.
Let’s look at a few more features:
Firepower – the ability to insert 17-, 19-, and even 33-round magazines into this firearm’s magazine slot is fantastic. Whether you are concealed carrying, are in active duty, or simply at the range, you will be able to find a magazine that you are comfortable with.
Accuracy – even with 33 rounds in a magazine and 1 in the chamber, the gun isn’t worth much without its accuracy. Being on target is ultimately the purpose of every round which leaves the barrel of any gun. The Glock 17 (and its extended family) are all extremely accurate. Point and shoot. Again, simple.
Durability – when it first came out, the question of durability was a big one. People were calling it a plastic pistol, and there was talk of the gun not being durable due to the elements which it was made of. After more than 30 years, the Glock’s durability cannot be contested or denied. It is very durable, and it can withstand harsh conditions. Heat, cold, mud, sand, countless rounds. The Glock can take it all and keep on firing.
Ergonomics – this was covered a little earlier, but let’s expand on it. Like every weapon, the Glock 17 is polarizing. Some love the way it feels in their hand, and some hate it. It is impossible to find a shape or size that is universally loved by all. I didn’t fall in love with the Glock 17 Gen 4 on sight, for instance. I worked on it, broke it in, and trained with it. What I found is that once you get used to the feel of a Glock 17, you discover that it is a wonderful fit. If you have a Gen 4, feel free to experiment. If you have a different Gen, and still want to get a different look or feel to your grip, you can accessorize with aftermarket products. Regardless, ergonomics are very important. As is training with your weapon. The grip and feel can be the most ergonomic thing ever, but unless you train, you may not be able to act when the time comes.
Sights – the factory-made sights are excellent, and even though some Glock owners choose to get other sights, they remain functional and very usable. The 3-dot configuration makes it easy to find your target and take a shot. Many companies make Glock sights, fit for day/night, made of tritium or other substances. (Learn more about tritium and other glock 19 sights here). Which brings us to…
Accessories – the Glock is easily accessorized, and there are many companies which manufacture Glock components. The Glock company itself makes a lot of accessories for its handguns. Glocks are so popular that any random gun shop will probably hold everything you need for your weapon. Popular accessories include different slide release levers, different magazine release levers, grip additions, trigger additions, sights, barrels, lights, lasers, magazine extensions, and even custom slide covers. Many of these are also available as glock 19 accessories, most notably in the form of grip plugs, extended magazine release levers, and customizable slide covers.
Reliability – Glock handguns are all very reliable. While being engineered and manufactured, they undergo extreme tests. Glock has recalled guns several times in the past, but only one of those times included the model 17. It was and is one of the most reliable 9mm guns out there.
Price – The price of a Glock 17 will run about $500. A reasonable price, most would agree. It isn’t a super cheap gun, nor should it be. There is a reason why this is one of the most popular firearms in the world, and it isn’t because it is cheap. For the price you pay, you get great value. You get the confidence, the security, and the peace of mind that a Glock provides.
The popularity of Glock handguns means that there are a lot of companies manufacturing accessories for them. This promotes healthy competition, which yields better prices and affordability across the board.
The Glock has been around for over 30 years, and it is still considered the gun of choice for many professional and non-professional shooters, everyday carriers, as well as military, police, and government agencies around the world. It is an amazing feat of engineering, and it has proven itself time and again. The original Glock 17 is an excellent weapon, and it ranks right up there with the best of them.
Some say that the Glock 17 gen 1 should no longer be considered a weapon, and that it is an antique. I suppose it is a matter of opinion. As far as I am concerned, if you have a Glock 17 Gen 1 which you maintain and train with regularly, it is a very viable carrying option.
Some Stats and Info:
Gun length 8.03 inches
Gun height 5.43 inches
Gun width 1.18 inches
Barrel length 4.48 inches
Barrel height 1.26 inches
Length between sights 6.49 inches
Weight – at 25.5 ounces (unloaded), the Glock is lighter than many other guns in the semi-auto 9mm caliber category. This lightness it has caused it to be the butt of many jokes, but Glock is the one who is having the last laugh. Loaded, the weight of the gun is 32.12 ounces.
65% of all U.S. Law Enforcement Agencies use the Glock.
Nearly 10 million Glock handguns have been sold, and Glock remains as popular today as it ever has been. People love using these firearms, and the model 17 remains the ‘go to’ gun for countless individuals.
The Glock 17 has been approved for use by many law enforcement agencies and military units around the world. Special Forces, Police Commandos, and even the United States Marshals Service use the Glock 17.
Upgrades (recalls)
Glock Gen 3 Release Date
Glock has issued upgrades to its various models. It invited carriers of certain guns and makes to send their handgun in for upgrading. Rather than call it a recall, it was dubbed an upgrade. A smart move, no doubt, but the fact is that Glock was forced to upgrade its pistols from time to time, because the weapons in question had failed certain tests, and were deemed temporarily unsafe.
1992:
The infamous “six part upgrade”, which included:
Extractor
Spring-loaded bearing
Firing pin safety and spring
Firing pin / striker
Trigger bar
2011:
Recoil spring exchange program. As mentioned earlier, this was a recall which included all Gen 4’s. This upgrade wasn’t issued until the company got numerous complaints about the gun. Once the exchange was made, consumers reported that the problems were fixed.
In a press release, Glock announced that it “has developed a new design to the recoil spring assemblies (RSA) on its Gen4 pistols to replace several variations that are functioning in the market today. As part of the company’s commitment to perfection, we are voluntarily exchanging the existing RSA in order to ensure our products perform up to GLOCK’s stringent standards.”
Other upgrades were made over the years, but the 17 was not affected. The only major upgrade was the 2011 one.
Cleaning and Maintenance
In order for an individual to feel confident in his gun, it needs to be checked and maintained regularly. Cleaning is necessary for ensuring the weapon is functioning properly.
To clean your Glock, you will need to field strip it, and then use a gun-cleaning kit to hit all of the different points where dirt and grime may accumulate. Basically, this means polishing the barrel inside and out, cleaning the slide, and brushing the frame and all of its rails. A brass brush is recommended, rather than a steel one. Brass won’t do any damage to your barrel, while steel may potentially cause some damage over time.
Having a clean gun means less malfunctions. In fact, a well-cleaned Glock 17 means zero malfunctions. If you take good care of your gun, you will have faster operation speed, very few jams, and a better shooting experience. Once you are done with the cleaning, it is time to apply some lube to sensitive areas of your Glock. Use only several drops of lube for the slide, a couple for the barrel, and one drop for the frame.
When I say “sensitive areas of your Glock”, I mean the places where there is most contact. These are the areas you will want to lube up, so that the constant contact won’t become a jam when that next round is being fired. You can – should? – use your finger for this particular job, and not a rag. Unlike a cotton rag, your finger will not soak up the oil.
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Glock 19 and the Future of Glock
The Glock 19 was Glocks answer to the call for a more compact version of the Glock 17. Now in it’s 4th generation the Glock 19 is still king among everyday shooters around the country. They’ll debate about which generation is better but they’ll never question the guns quality. These two handguns continue to be on the top ten lists for everyday carry. My Glock 17 comes out with me everyday. My Glock 19 stays at home as is the perfect backup weapon. The copious amounts of after market Glock accessories allow you to customize the gun to your liking. I keep my Glock 19 clean and simple. But the Glock 19 is only the tip of the Glock firearm iceberg.
Yes, the Glock company has grown in leaps and bounds ever since the release of the Glock 17 and 19. Take a look at the Glock 26 or Glock 43 for some different offerings from the company. Their innovation has led them to develop guns like the Glock 37 which married compact size with an ability to carry .45 caliber rounds. Much like every other gun in Glocks history shooters were demanding a compact and subcompact of the Glock 37. Glock listened to what their customers wanted and soon released the Glock 38 and 39. They then released the Glock 36 whose aim was firepower and concealment.
The #GLOCK website has a great tool to compare our different models so you can make the best decision. Take a look: https://t.co/3ltrN6GXnCpic.twitter.com/WVLwpUwO10
— GLOCK Inc. (@GLOCKInc) February 21, 2017
The build and ease of use of Glock Firearms have given them a loyal following with fans all over the world. Their guns are all about simplicity. If you own one you’ll know what I am talking about. They are some of the easiest guns to field strip. On top of that the interchangeability of their parts has led to the creation of new models like the Glock 30. More importantly, the component parts 100% interchangeable. Glock boasts that their firearms are manufactured using only 34 parts. This reduces the chance of a technical problem while enhancing reliability.
Glocks product line has only gotten more and more diverse. Glocks tireless effort to make the best firearms has made them one of the top gun manufactures in the world. They are on the cutting edge of what shooters want and require in a handgun. That’s why if you see someone carrying, odds are it’s a Glock. The future of Glock looks bright. I am excited to see what they come up with next! (I’m still holding out for a Glock ray gun… a guy can dream!)
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Anyone familiar with them has probably heard that there are several different Glock generations. The various Glock pistols get upgraded every so often with revised features, usually just a natural incremental change or new feature, that keeps the line evolving but without losing the central theme of polymer-framed, striker-fired goodness.
If you want to know what the difference is when eyeing those two Glock 9mm pistols at your local gun store, this is where you find out.
Every generation is good, but they keep getting better as they go. The most common that you'll find are Glock Gen 3, Gen 4 and Gen 5, but others are out there. Let's dive in and figure things out.
The first Glock generation emerged sporadically - often referred to as Glock Gen 1 - as the company was getting off the ground and diversifying their product lineup. It didn't all happen overnight, to be sure.
The first Glock pistol emerged in 1984, with the Glock 17. In fact, the entire first generation of Glock pistols was literally the Glock 17 only. These guns sold in great number, but are becoming somewhat rarer as fewer are in circulation, but are out there.
The first generation had few features, being little more than a polymer frame with a bit of texturing around the entire grip, controls on the left side, some sights and..that was really about it. The barest of bones; what you needed and nothing else.
However, it was accurate enough for government work and - being ruthlessly simple - very reliable and easy to maintain. That endeared it to many militaries and police departments worldwide. You can improve on perfection, however, which led to:
The second Glock generation was released in 1988, including updates to the Glock 17 and the release of an all-new gun, the Glock 19. The Glock 19 has been one of the most popular pistols ever created, and for good reason. It's easy to tote, easy to conceal, and easy to shoot. If you can't hit with a Glock 19, you need to not have guns and it's just that simple.
The second generation of Glock pistols only made minor revisions. Glock added a steel plate with the serial number to appease ATF regulations. The magazine design was also changed, with a new design of floorplate and a resistance insert at the bottom of the follower spring.
In 1911, Glock also introduced a new design of recoil spring, an integrated spring and guide rod. This replaced the two-piece unit that had been standard on the Gen 1.
Additionally, checkering was added to the front and rear of the grip housing for better hold on the gun.
During the Gen 2 era, additional calibers were added, including .40 S&W, .380, 10mm Auto and .45 ACP. The first of the long slide Glock pistols - the Glock 24 in .40 S&W - was created in this era, for competition use in Major power factor events. However, it was eventually discontinued just before new long slide models were introduced for Gen 3.
Late in the Glock Gen 2 product cycle, the first subcompacts were introduced. The Glock 26 in 9mm and Glock 27 in .40 S&W were launched around 1995, mostly with the civilian market in mind but also to serve as backup guns for law enforcement.
The last iteration prior to Gen 3 was the Glock 17C, which featured a ported barrel and slide for easier recoil control.
Glock Gen 3, as it was informally called, is still available from the factory, and was introduced in 1998. Along with updates to the then-current design, new calibers - .357 Sig and .45 GAP - were added to Glock's lineup, both fitting with their 9mm architecture.
The first addition was an accessory rail to the dust cover called the 'Universal Glock Rail' to allow lasers and lights to be mounted. The frame had thumb rests added above the grip on both sides, and the finger grooves - love 'em or hate 'em - were added to the grip housing. A new cross pin was installed above the trigger pin to ease stress on the locking block, lengthening service life even more.
The extractor was also revised to stick out when the pistol was loaded, thereby serving as a loaded chamber indicator.
Color entered the Glock world at this point, as FDE and olive drab finishes became options in addition to good ol' basic black. This is where the first of the Tiffany Blue glocks entered the picture.
The first single-stack Glock entered production in 2000, the Glock 36 in .45 ACP. The next ones..took some time.
Right before the end of Glock Generation 3, a few models - the Glock 22, 21, 31, 32 and 19 - were offered in a new RTF2 configuration. The Glock RTF2 - or 'rough textured finish' - pistols featured revised stipling on the sides, front and back of the grips, along with fish scale serrations at the rear of the slide. However, they weren't offered for long.
Glock Gen 4 debuted at the 2010 SHOT Show, with a host of new upgrades.
The first addition to the Gen 4 was the Glock Modular Backstrap, swappable backstraps that increased the trigger reach (and adding to the beavertail of the frame) as the user may wish. The base grip is slightly smaller than the third generation. 'Gen 4' is also added to the slide so you'd know which one it was.
How to tell the difference? Well, besides the 'Gen 4' on the slide, look at the backstraps. If you notice that it's definitely removable, with a line tracing the palm swell, rather than one solid housing, you got a Gen 4. If it's a solid grip housing, that's a Gen 3.
The texturing pattern on the grips from the Glock RTF2 were added to the entire Gen 4 lineup. Additionally, the magazine catches were enlarged and made reversible, so left-handed users could swap them. This caused some issues with early Gen 4 magazines, but that problem has since been corrected with newer mags.
The Generation 4 Glocks also received a dual magazine spring, which reduces felt recoil and lengthens service life.
The first two introduced were the Glock 17 Gen 4 and Glock 22 Gen 4 in early 2010, followed by the 19, 23, 26, 27 and every other 9mm-frame Glock. The large-frame Glocks, being the 10mm and .45 ACP pistols, were introduced in Gen 4 livery as of early 2013.
Two single-stack subcompacts entered production in 2014 and 2015, in the Glock 42 in .380 ACP and Glock 43 in 9mm, respectively. The Glock 43 was late to the single-stack subcompact party, having been beaten to the punch several years previously by Smith and Wesson, Walther, Springfield Armory and others. However, the 43 quickly made a name for itself as one of the best concealed carry Glock pistols available.
In 2016, a new variant called the Glock 17M was produced for the law enforcement market with some significant departures from the Glock Gen 4 pistols. It turns out that interested civilians wouldn't have to wait too long to get their own, either.
The Gen 4 has also yielded the Glock 19X, which has a full-length grip for accepting Glock 17 magazines with a 19-length slide. The Glock 19X was Glock's submission to the US military's XM17 pistol trials, though it was rejected in favor of the Sig Sauer P320 variant.
Falling somewhere in between the cracks is the Glock Silver Slimline pistols. This series consists of - at the time of this writing - the Glock 48 and Glock 43X pistols.
These guns share a frame and magazine, a little wider and longer than that of the Glock 43. The difference is the length of the barrel and slide. The 48 has the same barrel (as well as slide length) as the Glock 19, and the Glock 43X is literally the same barrel and slide as the standard 43. However, the Silver Slimline series adds forward cocking serrations and a silver PVD finish.
Both use the new Glock Slim 01 magazine, a 10-round single-stack magazine. This beefs up the capacity compared to the 43, or reduces it in order to make the Glock 19 slimmer and lighter.
Where do they fit?!
Technically, you could classify these pistols as something like Gen 4 pistols, except that they aren't and - strictly speaking - neither really are the Glock 42 or Glock 43. The striker and firing pin are unique to the 42/43/43X/48, rather than the standard firing pin and striker in Gen 4 pistols. The frame lacks the finger grooves of the Gen 3 pistols, but also lacks the Glock Modular Backstrap of the Gen 4 and Gen 5 guns. The trigger assembly also lacks the second cross pin of Gen 3 and Gen 4 Glock pistols above the trigger guard.
So..they have some Gen 5 features, some Gen 4 features and then some features all their own.
Glock Gen 5 was announced at the 2017 SHOT Show, and has yet only yielded a few pistols.
At the time of this writing, current offerings are the Glock 17 Gen 5, Glock 19 Gen 5, Glock 26 Gen 5, and the Glock 34 Gen 5 MOS, Glock 17 MOS and Glock 19 Gen 5 MOS pistols, which have a removable mounting plate should the user wish to install a red dot sight.
The Glock 45 has also been added to the lineup, which is actually a Gen 5 Glock 19X, though the base model Glock 45 is black and the 19X is in Coyote tan.
Another new addition to the Glock Gen 5 lineup is the Glock 47, which has quietly been ushered into existence. The pistol was revealed by the news that it had been selected as the new duty gun for the US Border Patrol, which was a bit of an eye-opener as a 47 had been unknown to anyone up to that point. The Glock 47 is the Glock 17 Gen 5 MOS slide on the Glock 45 frame, which has the 17's grip length but the frame length of the Gen 5 Glock 19. It hasn't been made available for commercial sale yet, but ostensibly will be soon.
The Glock Gen 5 does have some refinements, however, many of which were cribbed from the FBI's desired specs for the Glock 17M.
As far as Glock Gen 4 vs Gen 5, the Gen 5 adds the Glock Marksman Barrel. The magazine well is flared for easier reloads and a relief cut is made under the trigger guard for a higher grip. The finger grooves are omitted entirely, and ambidextrous slide controls and magazine catches are installed. The magazine baseplate is also revised.
The internal parts, which for the longest time had been virtually unchanged, have been mostly revised for the Glock Gen 5, which has required the frame to be slightly widened. The cross pin above the trigger guard has been omitted, and a new diamond-like carbon finish (a formulation of carbon with a semi-crystalline structure, unlike diamonds which are fully crystalline carbon) makes the outside tough as nails.
More will be coming, of course, but the Glock Gen 5 line is only a couple of years old. You can rest assured that more will follow.
Now we get into the nitty gritty - compatibility and Glock Holsters.
So, prior to Glock Gen 5, the first two and second two generations would both fit the same holsters. In other words, Gen 1 and Gen 2 Glock were interchangeable and Gen 3 and Gen 4 were interchangeable, but Gen 3 and Gen 4 would not fit a Gen 1 or Gen 2 holster.
The reason? The Glock Universal Rail. It was added to the Glock Gen 3 pistols, so any holster for Gen 1 or Gen 2 - which had the same slides and mostly the same frames - would not work in a holster for the Gen 3 and later.
However, this is less of a concern today for the most part because Glock Gen 1 and Gen 2 pistols are becoming less common on the used market. You can find them, but you won't find them in stores nearly as commonly as you will find used Glock Gen 3 pistols.
So, any holster for a Glock Gen 3 - say a Glock 19 Gen 3 - will also fit the Gen 4 model. Therefore, if you have a Glock 19 Gen 3 holster, it will fit a Glock 19 Gen 4. It would also fit the Glock 23 in .40 S&W and the compacts in .357 Sig and .45 GAP with the 4-inch barrel.
However, the Glock Gen 5 does NOT fit in most Glock Gen 3 or Gen 4 holsters. Since the Gen 5 has a wider slide to accommodate revised internals and ambidextrous mag releases and slide release levers, it won't fit a Glock Gen 4 holster properly.
What about Alien Gear holsters, though?
Glock 7 Digit Serial Number
As you might already know or imagine, Alien Gear Holsters offers a wide selection of holsters for Glock pistols. Alien Gear Glock holsters are available for almost every factory Glock pistol..but there are some fits that are different.
So, to explain that a little better.
Our ShapeShift Glock holsters fit the Gen 3 and Gen 4 series only. Due to the nature of the ShapeShift holster, which fully wraps the trigger guard and dust cover, only those pistols fit due to the rails.
Our ShapeShift Glock Gen 5 holsters will fit Gen 5 pistols upon release, but the Gen 5 will not fit the Gen 4/Gen 3 holster. Some purchasers have found the Gen 5 does fit the ShapeShift Glock holster, but our standards for fitment are very high. Unless our R&D team is completely satisfied, we don't say a holster fits a gun even if it would be 'good enough' for others. Good enough is not good enough for us.
Additionally, Glock Gen 1 and Gen 2 pistols will not fit the ShapeShift, as they lack the Glock rail.
However, our Cloak series of holsters will fit all five Glock generations. Adjustment will be required to dial in the fit, but the adjustable height of the mounting hardware makes the requisite fitment possible.
In any case, all Glock generations can be carried using Alien Gear holsters. However, most people purchasing a Glock holster at this point in time will - in all likelihood - be carrying a Glock Gen 3 or Gen 4, which is available in the Cloak series and ShapeShift series of holster both.