The Glock 21 Gen5 MOS pistol in .45 ACP (brand part no. UA215S203MOS) delivers improved accuracy and light recoil with the option to install an optic, giving full-size .45 ACP shooters a modern, optics-ready platform. Glock builds the pistol with Gen5 upgrades including a flared magwell, the Glock Marksman Barrel with target-style crown rifling, and ambidextrous slide stop levers for increased ergonomics. The MOS-cut slide is precision machined for popular red dot optics, and customizable backstraps in two sizes let shooters dial in grip circumference. The pistol ships with one adapter plate, three magazines, a mag loader, a cleaning kit, a pistol case, and a gun lock. Among full-size semi-auto handguns, this Glock 21 Gen5 MOS configuration favors .45 ACP shooters who want factory optic-mounting.

Key Specifications

• Chambered in .45 ACP.
• Capacity of 13+1 rounds.
• The barrel measures 4.61 inches, with the Glock Marksman Barrel rifling.
• The slide is optic ready and serrated, precision machined for MOS adapter plates.
• The frame is customizable with backstraps in two sizes.
• The kit includes three magazines, a mag loader, a cleaning kit, a case, and a gun lock.
• The safety is Firing Pin/Trigger Block.
• The sights are Fixed.
• The barrel finish is Black.

Frequently Asked Questions

What does MOS mean on this pistol? The slide is precision machined to mount red dot optics using included adapter plates.

How many magazines are included? Three 13-round magazines.

Buy the Glock 21 Gen5 MOS Pistol, .45 ACP

Factory optic-mounting on a full-size .45 ACP Gen5 platform is exactly what this Glock 21 Gen5 MOS Pistol, .45 ACP delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.