Glock, 21 Gen 5 MOS, Striker Fired, Semi-automatic, Polymer Frame Pistol, Full Size, 45ACP, 4.61″ Barrel, nDLC Finish, Black, Fixed Sights, Optics Ready, 13 Rounds, 3 Magazines, Comes with Glock OEM Adapter Plate 06 for Trijicon RMR Footprint