Glock G21 Gen5 MOS | .45 ACP | 4.6″ | UA215S201MOS

The Glock 21 Gen5 MOS is a full-size, striker-fired .45 ACP pistol with a 4.6-inch barrel and a Modular Optic System that accepts miniature red dot sights. It ships with three 10-round magazines and incorporates Gen5 refinements such as enhanced grip texture and the Glock Marksman Barrel for improved consistency. For an optic under $1,000 that pairs well with the MOS cut, consider the Trijicon RMR Type 2 for robust, compact red-dot performance. Common uses include duty carry and range/target shooting.

Product Specifications

• The UPC is 764503061639.
• The model is 21 Gen 5 MOS.
• The manufacturer part number is UA215S201MOS.
• The caliber is .45 ACP.
• The barrel measures 4.6 inches.
• The capacity is listed as 10+1.
• The product includes three 10-round magazines.
• The frame material is polymer.
• The finish is listed as Black (matte).
• The action is Safe Action (Semi-Auto).
• The optic footprint is a proprietary slide cut for the MOS system.
• The sights are fixed front and rear.
• Key features include a Modular Optics System, flared mag-well, and Glock Marksman Barrel.
• The package includes a plastic case, cleaning kit, magazine loader, and gun lock.
• State restriction: No direct ship to California.

The Glock 21 Gen5 MOS blends proven Glock reliability with Gen5 ergonomics and an optics-ready slide to suit shooters who want a full-size .45 ACP platform with modern features. Its combination of a polymer frame, MOS compatibility, and included magazine set makes it a practical choice for serious range use and duty-oriented applications where a larger-caliber platform is preferred.

Users commonly praise the pistol’s accuracy and the Gen5 improvements to ergonomics and reduced felt recoil.

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