The G21 V MOS delivers accuracy and light recoil. Featuring a reversible magazine; ambidextrous slide stop lever; GLOCK Marksman Barrel (GMB); nDLC surface finish and front serrations. The SAFE ACTION System is a fully automatic safety system consisting of three passive, independently operating, mechanical safeties. All three safeties disengage sequentially as the trigger is pulled and automatically re-engage when the trigger is released. MOS features a slide that is precision machined to provide a mounting system for popular optic sights. With multiple adapter plates (sold separately), you can quickly and easily mount miniature red dot sights.Includes one adapter plate, three magazines, mag loader, cleaning kit, pistol case and gun lock