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: 33 – 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