With the new inclusion of the .45 ACP in the Gen5 series, the G21 Gen5 MOS offers enhanced accuracy, reduced recoil and the added capability to mount an optic. This compact-size pistol retains all the hallmark Gen5 features, including the latest GLOCK nDLC surface finish known for its exceptional hardness and rust resistance. It also features the high traction Gen5 frame texture, a swift reversible magazine catch, an ambidextrous slide stop lever, the adaptable GLOCK Modular Backstrap System (MBS) for personalized operator comfort, the universally acclaimed GLOCK Safe Action System and highly visible orange magazine followers.