Patented KRISS Super V Recoil Mitigation System - Glock� Magazine Compatible - Smooth Trigger with Audible and Tactile Reset - Toolless Caliber Interchangeability - Ambidextrous Short Throw Safety Lever - Full Length MIL-STD 1913 Picatinny Top Rail - MIL-STD 1913 Picatinny Bottom Rail - Low Profile Folding Sights - KRISS M4 Stock Adaptor with DEFIANCE� M4 Stock - 4-pin Toolless Disassembly - Caliber: 10 mm - Capacity: 15+1 - Compliance: USA - Stock: M4 Stock - Front Sight: Flip Adjustable - Rear Sight: Flip Adjustable - Furniture: Advanced Polymer Composite - Finish: Cerakote - Overall Length: 24 in / 610 mm - 27.25 in / 692 mm - Weight: 7 lbs / 3.1 kg - Height: 6.8 in / 175 mm - Width: 2.56 in / 65 mm - Top Rail Length: 13 in / 332 mm - Barrel Length: 5.5 - Twist Rate: 1:10 RH - Thread Pitch: 9/16 x 24 RH - Barrel Finish: Black Nitride (QPQ) - # of Grooves: 6 - Barrel Material: 4140 Chrome Moly - Operating System: Closed Bolt Delayed Blowback - Action Type: Semi-Automatic - Trigger Type: Pivoting Single Stage - Trigger Weight: 5.5 lbs - Safety: Ambidextrous - Magazine Release: Button Left Side - Magazine Compatability: Glock� G20 Magazine