For shooters who prioritize proven reliability, ergonomic control, and straightforward maintenance in a full-size service pistol, the right choice balances mechanical integrity with practical features that support sustained use in defense and range environments.

GLOCK G21 GEN 4 brings a USA-made pedigree and Gen4 ergonomics to the .45 ACP platform. This example is clearly marked “GLOCK 21 Gen4 USA 45 Auto” on the slide and “MADE IN USA GLOCK, INC., SMYRNA, GA.” on the frame, and includes one (1) Glock OEM 13‑round .45 Auto magazine. Shop this product

Design and Construction

The GLOCK G21 GEN 4 is a full‑size, striker‑fired pistol with Glock’s Safe Action system and a 4.61‑inch steel barrel featuring polygonal rifling and a 1:15.75 RH twist. The matte black slide with rear serrations and fixed white‑dot front / white‑outline U‑notch rear sights provide a rugged, low‑maintenance sight picture. Polymer frame construction keeps weight reasonable while the Glock Universal accessory rail (one cross slot) allows for light or training accessories.

Gen4 Ergonomics and Controls

Gen4 upgrades here include the RTF grip texture with finger grooves for consistent muzzle purchase and an enlarged, reversible magazine release to accommodate both strong and weak‑hand shooters. The frame shows very good overall condition with clean bore and sharp polygonal rifling, indicating solid internal condition for continued service.

Cartridge and Capacity

.45 ACP remains a proven defensive caliber for stopping power at typical engagement ranges. This G21 ships with a factory 13‑round magazine for a standard 13+1 capacity, blending the larger .45 projectile with a usable magazine count for duty or home defense. At the listed price of $512.99, it represents a cost‑effective, USA‑manufactured option for those who prefer .45 caliber performance.

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Who Should Consider This Pistol

Choose this GLOCK G21 GEN 4 if you want a USA‑made .45 ACP with Gen4 ergonomics, proven Glock durability, and a clean bore with polygonal rifling. It’s well suited for duty, home defense, and range work where a larger caliber and robust construction are priorities. Check current availability and complete purchase options on the shop page — Check availability.

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