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The semi-automatic striker-fired Glock G21 marries the G17 concept to .45 ACP ammunition. A key commonality is the shared Spartan architecture. The design team kept the gun’s design pared down to just 40 parts including the ones in the magazine. The result has been a reliable, accurate and affordable semi-automatic pistol.

Within a package that’s 8.07” overall, 5.51” tall and 1.34” wide across the grips is a 4.61” long cold hammer forged barrel. The slide surrounding it is 1.12” wide and 7.60” long. Depending on sight type, sight radius is 6.69” (Glock Night Sights), 6.73” (steel sights) or 6.77” (polymer sights).

The trigger distance from the back of the grip to the trigger face is 2.85”. The G21 comes standard with a high-capacity double-stack 13-round magazine dotted with counting holes. Finally, empty weight with no magazine is 26.28 ounces while with a loaded magazine weight jumps to 38.8 ounces.

G21 is a Gen4 gun, so it has modular swappable backstraps for different palm swells, an ambidextrous slide stop lever and a reversible magazine catch. Moreover, the black polymer frame has an optimal grip angle and uses hardened steel guides. It also has an integrated single-slot accessory rail under the recoil spring housing.

The G21 uses a Safe Action trigger system with 6.3 pounds of factory-set trigger pull. The Safe Action system utilizes a trigger safety that blocks the trigger from moving back until the safety is pulled. There is also a firing pin bar safety, drop safety and loaded chamber indicator.

The trigger guard has a vertical front face that curves forward a tad at the bottom. Within the guard perimeter is plenty of room for a gloved finger.

The pistol grip is straight, deliberately lacking any finger grooves, but has a three finger recesses, horizontal studded serrations and a gentle palm swell in back. The sides are textured.

The G21 has ambidextrous minimalist slide stop levers and squared magazine releases instead of the circular ones common to many other guns.

The Glock G21 is made by both Glock in Austria and Glock USA.

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