Shadow Systems XR920, Foundation, Striker Fired, Semi-automatic, Polymer Frame Pistol, Compact, 4.5" Threaded Barrel, Nitride Finish, Black, Green Tritium Front Sight, Black Serrated Rear Sight, Optics Ready Slide, 17 Rounds, 2 Magazines, Includes (3) Backstraps and Optics Kit SS-3310-1DOptics Ready Foundation Slide Polymer Guide Rod/Optic Plate Flat Face Polymer Trigger • Action: Striker Fired • Capacity: 17 + 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