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Glock G17 Gen4 CO2 Blowback Pistol Review #35


Glock Introduction

Glocks are a brand of polymer-framed, short recoil-operated, locked-breech semi-automatic pistols designed and produced by Austrian manufacturer Glock Ges.m.b.H. The firearm entered Austrian military and police service by 1982 after it was the top performer in reliability and safety tests.



Glock Development

In 1980, the Austrian Armed Forces announced that it would seek tenders for a new, modern duty pistol to replace their World War II–era Walther P38 handguns.

The Glock 17 became the world’s best-selling pistol in 1986. This led to a series of improvements and improvements to its design. A few years later, after it had gained a large reputation for superior performance, it is reported that Glock was aware of the Austrian Army’s planned procurement, and in 1982, assembled a team of Europe’s leading handgun experts from military, police, and civilian sport-shooting circles to define the most desirable characteristics in a combat pistol.

Several samples of the Glock 17 were submitted for assessment trials in early 1982. After passing all of the exhaustive endurance and abuse tests, the Glock emerged as the winner. The handgun was adopted into service with the Austrian military and police forces in 1982 as the P80, with an initial order for 25,000 guns.

It outperformed eight different pistols from five other established manufacturers (Heckler & Koch of Germany offered their P7M8, P7M13, and P9S, SIG Sauer of Switzerland bid with their P220 and P226 models, Beretta of Italy submitted their model 92SB-F, FN Herstal of Belgium proposed an updated variant of the Browning Hi-Power, and the Austrian Steyr Mannlicher entered the competition with the GB).

The results of the Austrian trials sparked a wave of interest in Western Europe and overseas, particularly in the United States, where a similar effort to select a service-wide replacement for the M1911 had been going on since the late 1970s (known as the Joint Service Small Arms Program).

In late 1983, the United States Department of Defense inquired about the Glock pistol and received four samples of the Glock 17 for unofficial evaluation. In 1985, after joint Norwegian and Swedish trials from 1983 to 1985, the Glock 17 was accepted into service as the P80 in Norway, and in 1988 as the Pistol 88 in Sweden, where it surpassed all prior NATO durability standards. 

1st Generation Models

The first-generation Glock pistols are most notably recognized by their smooth “pebble finish” grip and finger groove-less frames. The Gen 1 frame pattern and design was used by Glock from 1982 through 1988 and pre-dates the checkered grip patterns used in the second-generation of Glocks.

It’s not common practice to import firearms to the United States in the early 90s without a serial number, which are still required today. This means the first Glock 17s imported to the US were made with a stamped serial number on the slide, barrel, and a small metal plate inserted into the bottom of the polymer frame.

The first generation of these pistols were also manufactured with a barrel that had a smaller overall diameter and thinner bore walls, later known as “pencil barrels.” These early Glock 17 “pencil barrel” pistols are considered rare and highly desirable by Glock collectors.

The earliest Glock boxes had ammunition storage compartments that allowed for 17 rounds of 9mm to be stored with the pistol. These boxes have since been discontinued by Glock, and Glock has instead switched to a magazine feed mechanism that allows for 29 rounds to be loaded into the G17.

2nd Generation Models

Glock has improved second-generation pistols by making them a bit better looking, but the fundamentals of their design haven’t changed. The only significant change in functionality was the addition of a safety catch for the slide.

Firearms are defined as any product that launches a projectile through the force of explosive energy generated by a device. The most common types of firearms are rifles, pistols, and shotguns. Rifles, such as the M16, are designed to be used for accuracy. Pistols, such as the Glock, are designed for rapid fire and convenience.

The magazine was modified by cutting the floorplate, removing the follower spring, and inserting a resistance plate at the bottom of the magazine.

3rd Generation Models

In 1998, the frame was further modified with an accessory rail (called the “Universal Glock rail”) similar to a picatinny rail to allow the mounting of laser sights, tactical lights, and other accessories.

Third-generation models of the Glock pistol include thumb rests on both sides of the frame and finger grooves on the front strap. These upgraded guns are informally referred to as (early) “third-generation” models. Later third-generation models include a modified extractor that serves as a loaded chamber indicator and the locking block is enlarged, with the addition of an extra cross pin.

This is a great cross pin because it’s known as the locking block pin and it’s located above the trigger pin. The polymer frames of third generation models can be black, flat dark earth, or olive drab. Besides that, non-firing dummy pistols and non-firing dummy pistols with resetting triggers have a bright red frame. The Simunition-adapted practice pistols have a bright blue frame for easy identification.

This pistol featured a new checkering texture around the grip and new scalloped (fish gill-shaped) serrations at the rear of the sides of the slide. Many of the existing models were updated to the RTF2 version. These include the 31, 32, 23, 21, and 19.

Some of those did not have the fish gills. Some of those did have the fish gills, but some didn’t.

4th Generation Models

Fourth generation Glock models. At the 2010 SHOT Show, Glock presented the “fourth generation”, now dubbed “Gen4” by Glock itself. Updates centered on ergonomics and the recoil spring assembly.

In the initial two guns, the Glock 17 and the Glock 22, there are the full size handguns that are available in 9 mm and.40 caliber.

The new Glock 22 Gen 4 pistol is based on the Glock 20, but has many enhancements over the previous generation models. It features the Glock “slide release” safety mechanism. The frame is textured and the grip is slightly reduced in size to give the user a better feel when firing. The gun also features an improved magazine. The slide on the new model is designed to provide an easier extraction.

To make the replacement pins for your M1911, you must purchase the appropriate replacement pin at a gun store. Be sure to check the length of the pin against your trigger mechanism in order to make sure it will fit.

With the medium backstrap installed, the grip size is identical to the third-generation pistols. The magazine release catches are enlarged and reversible for left-handed use. The fourth-generation magazine releases have two notches cut on the bottom of the magazine.

The third-generation Glock model 34 pistol can be fired as soon as the slide returns to battery. A user can pull back on the slide and have the gun ready to fire as soon as the slide stops forward motion. It’s important to note that pulling back on the slide during the firing cycle will cause an internal mechanical locking mechanism to engage, resulting in the firing pin striking the primer of the cartridge.

Glock also moved to a dual recoil spring assembly for its latest generation subcompact line of handguns.

The slide and barrel shelf are in their new position, and the front portion of the polymer frame has been widened and internally enlarged, to accommodate the dual recoil spring assembly.

It took a while, but Glock finally introduced a fourth-generation pistol in July 2010. The introduction of the fourth-generation Glock handguns continued in July 2010 when the smaller “compact” Glock 17 and Glock 22 pistols became available for retail.

After its introduction at the SHOT Show in January 2013, many Glock fans began buying the Gen4 Glock models.

5th Generation Models

“Fifth-generation” Glock pistols were first shown in August 2017. They feature improvements that focus on improving ergonomics and reliability. There are no differences between the old and new series other than aesthetics.

The two 5th-generation handguns announced were the Glock 17 and Glock 19, chambered for the 9mm round. Some noticeable changes in the 5th-gen models are ambidextrous slide stop levers, DLC finish for barrel and slide, a barrel with a revised style of polygonal rifling (called the “Glock Marksman Barrel” by Glock), a deeper recessed barrel crown, an omission of the finger grooves on the grip, and a flare magazine well.

The locking block pin that was added to the Glock 17 Gen 5 in 2013 is removed. It is now found in the third generation. The second and fourth generation models do not have the pin.

These new magazines will allow for the front serrations to give the shooter the additional choice of using the front serrations to improve grip and reduce finger fatigue.

Operating Mechanism

The Glock 17 is a short recoil operated, locked breech semi-automatic pistol that uses a modified Browning cam-lock system adapted from the Hi-Power pistol. Its locking mechanism uses a linkless, vertically tilting barrel with a rectangular breech that locks into the ejection port cut-out in the slide.

The slide rides on rails that connect to a latch above the trigger guard. As the slide moves rearward, the rail is forced down and unlocks the slide from the barrel.

This camming action terminates the barrel’s movement while the slide continues back under recoil, extracting and ejecting the spent cartridge casing. The slide’s uninterrupted rearward movement and counter-recoil cycle are characteristic of the Browning system. Glock pistols incorporate a number of features intended to enhance reliability in adverse conditions, such as utilizing advanced metal coatings, “stub” slide guides instead of true frame rails, and an unusual cocking mechanism wherein the trigger is partially responsible for cocking the striker.

By relying partially on force from the shooter’s trigger finger to cock the striker, a Glock effectively reduces the load on the recoil spring as the action cycles, whereas almost all other striker-fired pistols on the market rely fully on the recoil spring to cock the striker. This design gives the recoil spring fewer tasks as the action cycles, helping to ensure that sufficient energy is available to strip a new round from the magazine and achieve full battery even when the breech, chamber, and/or magazine are heavily fouled.

Some gun makers have produced striker-fired, semi-automatic handguns for many years. Glock has made several striker-fired, semi-automatic handguns for many years, and they’re considered to be some of the most reliable striker-fired, semi-automatic handguns available.

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The slide features a spring-loaded claw extractor, and the stamped sheet metal ejector is pinned to the trigger mechanism housing. Pistols after 2002 have a reshaped extractor that serves as a loaded chamber indicator.

This rifle has an external hammer, but the actual firing mechanism is actuated by the bolt carrier assembly. The sear activates the hammer when the trigger is pulled.

As the trigger is pulled, the firing pin is then fully cocked. At the end of its travel, the trigger bar is tilted downward by the connector, releasing the firing pin to fire the cartridge.

The trigger mechanism prevents the firing pin from moving back into full-cock and prevents the cartridge from chambering a new round. This is known as a safe action trigger mechanism, or a preset trigger mechanism, and the term is commonly used in the firearms industry to refer to this feature.

American law enforcement agencies were among the first to adopt the Glock pistol’s two-stage trigger design, which increases the trigger pull by about 2 pounds, and introduced this request after the trigger pull was criticized by several of their members.

The Glock‘s frame, magazine body, and many other parts are made from a high-strength nylon polymer that was invented by Gaston Glock. It’s called Polymer 2. It’s especially formulated to provide increased durability and is more resilient than carbon steel and most steel alloys.

A polyurethane-framed polymer gun, similar to the Hi-Point.380ACP pistol, is more compact than a traditional steel or aluminum framed gun. It’s made to be operated by one hand, making it easier to use in tight spaces.

The trigger guard itself is squared off and checkered, and it’s designed with a square profile at the front end. The grip has an angle of 109° and a nonslip, stippled surface on the sides and both the front and rear straps.

The action of the 1911 is retained by a steel axis pin that holds the trigger and slide catch. The trigger housing is held to the frame by means of a polymer pin. A spring-loaded metal plate serves as the slide catch, which is secured from unintentional manipulation by a raised guard molded into the frame.

There was concern that the polymer construction of Glock pistols would make the weapons difficult to detect by airport X-ray machines. This could make it easier for illegal imports into the United States.

Although most Glocks were made from aluminum, many people think that a polymer frame (like those used in Polymer 2. makes a gun undetectable. That’s not entirely true; Polymer 2 is visible under a special x-ray machine. But the truth is, many guns are made out of steel; that’s what makes a gun bulletproof and hard to detect with a metal detector.

The Glock pistol has a low slide profile, which holds the barrel axis close to the shooter’s hand and makes the pistol more comfortable to shoot by reducing muzzle rise and allowing for faster aim recovery in rapid shooting sequences.

The slide is made from a single block of ordnance grade steel, and is hardened using a combination of heat treating and special nitriding process called Tenifer.


A sight is a device that allows you to accurately fire your weapon. Glocks are known for their adjustable sights and the one that was originally included with the 9mm Glock pistols, the adjustable rear sight, helped to make the Glock a popular pistol for competition shooters.

In the gun world, the Glock G42C is called the “weekend” sight. It was designed and made by Glock, so it has to meet ATF’s importation requirements. That means it couldn’t be designed in a day or two, so they created it over a weekend, and it’s been named as such since then.

The original polymer sights on the first generation Glock 17s were prone to breaking over time and wearing, so Glock changed to a fixed combat type design, which included a raised front sight and a notch in the rear sight post.


The Glock pistol accessories available from the factory include several devices for tactical illumination, such as a series of front rail-mounted “Glock tactical lights”, which feature a white tactical light and an optional laser sight.

A lightweight tactical flashlight and adapter are also available to attach to a magazine bottom and illuminate your magazine for longer periods of time. It’s a perfect match for law enforcement use.

Polymer handguns come in a variety of configurations and are made to fit all types of shooters. In addition, Glock produces optional triggers, recoil springs, slide stops, magazine release levers, and maritime spring cups.

Spring cups are designed to prevent corrosion from attacking the firing pin and ensure the pistol continues to function properly even after getting wet. The extra openings in the cup, as well as its configuration, offer enhanced reliability when the pistol is submerged in water.

Glocks offer a standard nonadjustable polymer sight line, as well as three alternative sights. These include steel, adjustable, and self-illuminating tritium night rear sights, and factory steel and self-illuminating tritium contrast pointer steel front sights.

Glock G17 Gen4 Airsoft Extended Specs

Max Velocity335 fps
Overall Length8.0″
Weight1.5 lbs
Suggested forCQB
Barrel Length3.75″
Shot Capacity23
BarrelSmooth bore
Front SightPost
Rear SightFixed
Hop UpAdjustable
Body TypePistol

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