GLOCK 19 in 9 mm Luger is the best handgun with a versatile role. In addition to its use as a conventional service pistol, it is ideal for use as a backup weapon or for concealed carry purpose.

The GLOCK 19 Gen4 pistol in 9 mm Luger offers great firepower while allowing a good shot quickly and accurately. The modular back strap system makes it possible to instantly customize its grip to accommodate any hand size. The reversible magazine catch makes it ideal for left and right-handed shooters.

Glock is 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 pistols have become the company’s most profitable line of products, and have been supplied to national armed forces, security agencies, and police forces in at least 48 countries.

Glocks are also popular firearms among civilians for recreational and competition shooting, home- and self-defense, both in concealed or open carry. In 2020, the Glock 19 was the best selling pistol on GunBroker.

Product evolution

Glock has updated its basic design several times throughout its production history.

First-generation models

The first-generation (Gen 1) Glock pistols are most notably recognized by their smoother “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 Glock pistols.

The first Glock 17s imported to the US were serialized with an alpha-numeric (two letter prefix followed by three numbers) stamped into the slide, barrel, and a small metal plate inserted into the bottom side of the polymer frame.

The first documented Glock 17s (by serial number) imported into the US were from the AF000 series in January 1986, followed by AH000, AK000, and AL000.

These early Glock (Gen 1) pistols (serial number prefix AF through AM) 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 barrels were later redesigned with thicker bore walls and manufacturing continued to evolve and improve the design of Glock pistols.

Many of the first-generation Glocks were shipped and sold in the iconic “Tupperware” style plastic boxes. The earliest Glock boxes had ammunition storage compartments that allowed for 17 rounds of 9mm to be stored with the pistol.

This box design was later changed by Glock to meet BATF import requirements and the ammunition storage compartments were removed.

Second-generation models

A mid-life upgrade to the Glock pistols involved the addition of checkering on the front strap and trigger guard and checkering and serrations to the back strap. These versions, introduced in 1988, were informally referred to as “second-generation” models.

To meet American ATF regulations, a steel plate with a stamped serial number was embedded into the receiver in front of the trigger guard. In 1991, an integrated recoil spring assembly replaced the original two-piece recoil spring and tube design.

The magazine was slightly modified, changing the floorplate and fitting the follower spring with a resistance insert at its base. Third-generation models

A “third-generation” Glock

Identified by the addition of an extra cross pin above the trigger, finger grooves, a reshaped extractor that serves as a loaded chamber indicator, and an accessory rail

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. Thumb rests on both sides of the frame and finger grooves on the front strap were added.

Glock pistols with these upgrades are informally referred to as (early) “third-generation” models.

Later third-generation models additionally featured a modified extractor that serves as a loaded chamber indicator, and the locking block was enlarged, along with the addition of an extra cross pin to aid the distribution of bolt thrust forces exerted by the locking block.

This cross pin is known as the locking block pin and is 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 (“P” models) and non-firing dummy pistols with resetting triggers (“R” models) have a bright red frame, and Simunition-adapted practice pistols (“T” models) a bright blue frame for easy identification.

In 2009, the Glock 22 RTF2 (Rough Textured Frame 2) (chambered in .40 S&W) was introduced. 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 became available in the RTF2 version, including the 31, 32, 23, 21, and 19. Some of those did not have the fish gills.

Fourth-generation 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. The initial two fourth-generation models announced were the full-sized Glock 17 and Glock 22, chambered for the 9×19 mm Parabellum and .40 S&W cartridges, respectively.

The pistols were displayed with a modified rough-textured frame, grip checkering, and interchangeable backstraps of different sizes. “Gen4” is rollmarked on the slide next to the model number to identify the fourth-generation pistols.

The basic grip size of the fourth-generation Glock pistols is slightly smaller compared to the previous design. A punch is provided to remove the standard trigger housing pin and replace it with the longer cross pin needed to mount the medium or large backstrap that will increase the trigger distance by 2 mm (0.079 in) or 4 mm (0.16 in).

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.

To use the exchangeable magazine release feature, fourth-generation Glock magazines have a notch cut on both sides of the magazine body.

Earlier versions of the magazines will not lock into the Gen4 pistols if the user has moved the magazine release button to be operated by a left-handed user. Gen4 magazines will work in older models.

Mechanically, fourth-generation Glock pistols are fitted with a dual recoil spring assembly to help reduce perceived recoil and increase service life expectancy.

Earlier subcompact Glock models such as the Glock 26 and Glock 30 have already used a dual recoil spring assembly that was carried over to the fourth-generation versions of those models.

The slide and barrel shelf have been resized, and the front portion of the polymer frame has been widened and internally enlarged, to accommodate the dual recoil spring assembly. The trigger mechanism housing has also been modified to fit into the smaller-sized grip space.

The introduction of fourth-generation Glock pistols continued in July 2010 when the Glock 19 and Glock 23, the reduced size “compact” versions of the Glock 17 and Glock 22, became available for retail. In late 2010, Glock continued the introduction of fourth-generation models with the Glock 26 and Glock 27 “subcompact” variants.

In January 2013, more fourth-generation Glock pistols were introduced commercially during the annual SHOT Show, including the Glock 20 Generation 4 along with other fourth-generation Glock models.

In September 2011, Glock announced a recoil spring exchange program in which the manufacturer voluntarily offers to exchange the recoil spring assemblies of its fourth-generation pistols (with the exception of the “subcompact” Glock 26 and Glock 27 models) sold before 22 July 2011 at no cost “to ensure our products perform up to GLOCK’s stringent standards”, according to the company.

M series

On 29 June 2016, the United States Federal Bureau of Investigation (FBI) awarded a contract to Glock to provide new 9×19mm Parabellum chambered duty pistols. The solicitation specifications deviated from the specifications of Glock fourth-generation models.

In August 2016, the Indianapolis Metro Police Department (IMPD) started training with a batch of Glock 17M pistols.

The most obvious difference with the Glock third- and fourth-generation models on published images is the omission of finger grooves on the grip. In October of that year, the IMPD issued a 17M voluntary recall following failures encountered while dry firing the pistols during training.

According to Major Riddle with the IMPD, “Glock is working to correct the problem and we hope to begin issuing the new [17Ms] as soon as December.”

Fifth-generation models

A “fifth generation” Glock 17 as adopted by the French Armed Forces in 2020, with standard version specifically made for the FAF: front serrations, coyote brown grip, and lanyard attachment.

In August 2017, Glock presented the “fifth generation” or “Gen 5”. The revisions centered on ergonomics and improving reliability. Many parts of fifth-generation Glock pistols cannot be interchanged with those of the previous generations.

The two fifth-generation models announced were the Glock 17 and Glock 19, chambered for the 9×19 Parabellum.

Some conspicuous changes on the fifth-generation models are ambidextrous slide stop levers, DLC surface finish for barrel and slide, a barrel featuring a revised style of polygonal rifling (called the “Glock Marksman Barrel” by Glock), a deeper recessed barrel crown, omission of the finger grooves on the grip, a flared magazine well, and a reintroduction of a half-moon-shaped cutout on the bottom front of the grip.

The locking block pin located above the trigger pin that was introduced in the third generation is omitted. Many internal parts were less conspicuously revised. “Gen 5” is rollmarked on the slide next to the model number to identify the fifth-generation pistols.

The “Gen 5” slide can feature front serrations (FS) to provide an additional tactile traction surface choice. The magazines were also revised for the fifth-generation models, the redesigned magazine floor plates feature a frontward protruding lip to offer grip for manual assisted extraction and the magazine follower became orange colored for easier visual identification.

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