Shadow Systems MR920, Foundation, Striker Fired, Semi-automatic, Polymer Framed Pistol, Compact, 4" Barrel, Nitride Finish, Black, Green Tritium Front Sight, Black Serrated Rear Sight, Optics Ready Slide, 15 Rounds, 2 Magazines, Includes (3) Backstraps and Optics Kit SS-1306-1DOptics Ready Foundation Slide Polymer Guide Rod/Optic Plate Flat Face Polymer Trigger • Action: Striker Fired • Capacity: 15 + 1 • Finish: Black Nitride • Sights: FS: Green Tritium RS:Black • Barrel length: 4" • Overall length: 7.13" • 15in Free-Float MLOK Rail/ Ambi Bolt Release