Accessories for Glock 21

The Glock 21 is the full-size .45 ACP pistol from Glock, sharing its frame dimensions with the G20. Used in law enforcement and sport shooting where the .45 ACP chambering is required, the MOS variant accepts a factory optics plate for direct red dot mounting.

Upgrades for the Glock 21

The Glock 21 can be tailored across the main competition upgrade areas:

• Grips – panel texture and frame profile change how consistently your hand returns to the gun, the foundation of recoil control and a repeatable draw.
• Triggers – a refined trigger sharpens the break and shortens the reset, so shots break where you expect and you are back on the sights sooner.
• Sights and red dot mounts – upgraded irons or a slide-mounted optic give a single focal plane and faster acquisition from the holster and between targets.
• Magwells – a wider, chamfered magazine well makes the reload more forgiving under stage pressure.
• Base pads – extended pads add capacity and a little weight at the base of the magazine, and help it seat reliably.
• Frame mounts and weights – added forward weight settles the muzzle and improves balance, particularly in Open setups.
• Magazine releases and thumb rests – an extended release speeds mag changes without breaking your grip, and a thumb rest gives a fixed hand reference.

Compatibility is specific to each model — confirm the fit on the individual product page before ordering.