Glock 21 Gen5 MOS | .45 ACP | 4.60in | UA215S203MOS

The Glock 21 Gen5 MOS is a full-size, optics-ready semi-automatic pistol chambered in .45 ACP with a 4.60 inch Glock Marksman Barrel (GMB). Gen5 improvements include a flared mag-well, modular backstraps, ambidextrous slide stop levers and removal of finger grooves for broader ergonomic fit. The MOS slide provides a proprietary optic footprint to accept popular miniature red-dot sights; a compact red-dot such as the Holosun 507K pairs well with this platform and remains under $1,000.

Typical applications include duty/service use and range training or target work where the .45 ACP’s ballistics and the Gen5 ergonomics are desirable.

Product Specifications

• The UPC is 764503059797.
• The manufacturer is Glock.
• The model is listed as 21 Gen5 MOS.
• The caliber is .45 ACP.
• The barrel length is 4.6000 inches and is identified as a Glock Marksman Barrel (GMB).
• The frame material is polymer with a black finish.
• The slide is described as serrated and finished in black nDLC / colored finish.
• The sighting system is fixed front and rear white-dot/outline sights.
• The pistol features a proprietary MOS slide cut for mounting micro red-dot optics (adapter plate included).
• The package includes three magazines (magazine configuration noted in package details).
• Notable features include a flared mag-well, front slide serrations and the Glock Marksman Barrel.
• The action is Safe Action (striker-fired) with internal firing pin and trigger safeties.
• The pistol ships in a black plastic case and includes a mag loader, cleaning kit and gun lock per package contents.

The Gen5 MOS 21 blends traditional .45 ACP performance with the ergonomics and modularity of Glock’s latest service pistols. Its optics-ready slide and improved barrel profile make it well suited for shooters who want a large-frame .45 with modern features for sighting and handling. The included accessories and modular backstraps let owners tailor the fit and carry a practical complement of spare magazines for extended range sessions.

Owners and reviewers commonly note its improved accuracy over previous generations and reduced felt recoil relative to the cartridge’s reputation.

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