Glock Number - A common question for new Glock buyers is "What gene is my Glock?" Until the release of the 4th generation, Glock no longer officially recognized model numbers, promoting the idea that "a Glock is a Glock is a Glock - they are all the same." But early collectors noticed the differences and unofficially chose three main repeats, or "generations," to classify them. The nomenclature became so common that Glock followed suit with the release of Gen 4 in 2008 and their promotional literature now highlights the earlier Gens in places.
The images below will help you clearly identify which generation your Glock is, but be aware that there is a lot of overlap as the models change slowly. Gen 3 guns are also still in production due to gun restrictions in California, so you could have a Gen 5 gun that actually predates your Gen 3! Photo notes identify key features that are consistent throughout a generation, but minor changes in markings and interiors are possible at various intervals—and sometimes back and forth—within the same generation. Thus, serious breaks between generations dictate only significant frame revisions, many parts are interchangeable in two or more, but some changes last only a short generation period.
Glock Number
The first generation was a constant change. The original design, however reliable, was still in development. A consistent feature is the grip texture that wraps around the entire handle (without checking the front and rear tires). It is smoother than the later generation and is considered by collectors to have a "pebble texture". Early weapons had a thinner, stainless steel barrel with a Parkerized coating introduced earlier (no later than the AD prefix) and a greater barrel wall thickness appearance than the AN prefix. There are also some variations in the magazine, case, and minor internals. All weapons have Austrian hallmarks, but no consistent placement or number of markings. Very early (US Standard) weapons and weapons intended for European markets do not have a serial number on the frame. Most early guns were also fitted with aiming sights, which were referred to as "weak sights" because of their fragility. Standard (fixed) sights are also correct, though the target version will come at a premium. All frames had a crescent moon tabletop relief on the underside of the front bands, except for the few 19s that were made.
Sold Price: Glock 27 .40s&w Ported Barrel Pistol (used)
The 2nd generation is what many novice collectors or even ignorant dealers refer to as "Gen 1". The confusion stems from two factors: 1. Generation 1 is very rare and may not have been seen by many casual observers. 2. Many models were introduced in the 2nd generation line and some consider them "1st generation" because it is the first issue of that particular model. To clarify, if you have a model 20 or higher, you have a Gen 2 Glock, even if it's the first version of this gun. For the 17-19 models, the obvious difference from the 1 and the 2 is that the notch has been added to the front and rear tires and the texture of the side panels has changed (deeper than the 1st generation). Gen 2 also introduced 5 additional calibers and all non-.380/9mm guns were fitted with a second blocking pin to prevent frame bursting due to heavier recoil. It is important to note that pins do not mean generation as many believe. The 9mm frame only has two pins in Gen 1 to Gen 3 production, while all other calibers have 3 pins. All full size frames are worn over the magwell relief on the underside of the front bracket.
By the late 1990s, Glock had become a dominant force in the US handgun market, and other manufacturers attempted to copy the design. This led to some pressure on Glock to "innovate" his design to try and stay ahead of the pack. The Gen 3 changes actually started in 1995 with the release of the subcompact models. It was felt that the grip would be too small for many, so finger grooves were molded into the front strap to increase purchase and prevent rotation due to recoil. This began a 3-year transition period before all models were completely changed in '98. Transitional models of some of the larger frames are quite rare (especially in ported variants) - see https:///transitional/ for more information. The Gen 3 has finger grooves on the front, thumb rest recesses on the top of the handle, and an accessory molded into the dust cover. As mentioned above, for the 9mm caliber only, you will still find 2-pin designs in the early 3rd generation releases. In the early 2000s, the frames were simplified to all three pinions.
By the time the 4th generation came out, the Glock "pistol" was ubiquitous, but again faced challenges with more innovative designs. A craze that consumers have embraced is interchangeable back straps to better fit different hand sizes. Glock first experimented with narrower grips in the Gen 3 SF models (it was only in .45 and 10mm calibers). The modular back system brought SF proportions to all frames with two larger size options and even beaver tail adapter inserts. Redesigned from the ground up, the inside is actually built with the .40S&W recoil profile in mind, then scaled down for 9mm (where Gen 1-3 is designed in the opposite direction). This should make the .40 models more durable while continuing the legendary reliability of the 9s. The grip texture has also been changed to a more aggressive pattern on the side panels - again, this was first experimented with in the near-term of late 3rd Gen weapons with the so-called "RTF2" texture. The RTF2 is technically Gen 3, possibly Gen 3.5, and was produced (apart from special period editions) from 2009 to 2011 - see image at bottom of this page.
The first-generation 5 models were actually preceded by the release of the new subcompact slim models 42 and 43. These models started out as major redesigns with all new internal components to accommodate the smaller size, and the FBI played a part in this changes. Larger guns on request for M models. Models 19X, 42, 43, 43X, 44, 45, and 48 technically do not carry the Gen 5 designation on the slide, but are still the most similar to the other Gen 5 pistols. The 17 and 19 were officially released as Gen 5s in 2017 and were followed by other 9mm and .40 S&W offerings, but no .357 Sig, 10mm or .45 ACP offerings have been produced to date . Notable changes include a "shooter" barrel, full ambidextrous controls, flared magazine, and finger grooves in the foregrip.
Glock Pistols Gen3 Vs Gen4. What Is The Difference Between The Generations?
There are (at least) two other designs that can be encountered that lack generational differences or are so different as to be difficult to identify from the discourse above: 1. RTF2 Third Generation and 2. FBI M Series.
RTF2 is an abbreviation for "Rough Texture Framework, version two". The first version was only made as a prototype and was never released, although one is still on display at the Cody Firearms Museum. Designers settled on the second version and new molds were created to incorporate this grip texture into the standard 3rd generation design. All internals are the same, so the only difference is the grip texture. As you can see in the exploded view, the entire handle is covered in little pyramids – and let me tell you, they are sharp! This gun really does hold your hand, even when wet. Glock supplied them mainly to the police from 2009 to 2011, but the design is a clear step between the third and fourth generation weapons. The pyramid concept progressed, but with larger pyramids like the RTF2 pyramids, they were also subject to wear and tear. See https:///rtf2g/ for more images.
Finally, we need to talk about the FBI's M-series pistol. The 17M and 19M actually preceded and possibly inspired the 5th generation guns. They were built to specifications requested by the FBI as the department's new service weapon and incorporated design changes from the Mini 42/43 models and new ideas. These were the first Glocks to feature ambidextrous controls and modifications to the rifle designed to improve accuracy. Although outwardly the M rifle looks almost exactly like the Gen 5 - the main differences are internal, so most collectors consider them part of the Gen 5 family. However, for the right person, adding an "M" to the model designation will make a big difference in the price they want.
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