With the introduction of the .45 ACP to the Gen5 lineup, the G21 Gen5 MOS offers enhanced accuracy, reduced recoil and the new option to mount an optic. This compact-size pistol embodies all the defining Gen5 qualities: the latest GLOCK nDLC surface finish, celebrated for its exceptional hardness and rust resistance, 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.