Cross compatibility has long been one of the best features in our pistol magazine lower platforms like the Mk17. Designed to use Sig P320 9mm magazines shooters can swap seamlessly from pistol to PDW without having to invest in a new variety of proprietary magazines. - The 9mm DISSENT Mk17 combines robust build quality personalized style with multiple Cerakote coating options and advanced features throughout. A 1913 picatinny rail end plate makes for quick and easy attachment of pistol braces or stocks* that match your use and style. Bolt operation is accomplished via the forward non-reciprocating side charger allowing for quick use while staying on target. - Platform: Mk17 - Caliber: 9mm - Operating System: Compact Action-Radial Delayed Blowback - Barrel Length: 6.5 - Barrel Twist: 1:10 - Barrel Contour: MT - Barrel Material: 4140CM SBN - Barrel Twist: 1:10 - Muzzle Device: CMMG ZEROED Linear Compensator - Muzzle Thread: 1/2 x 28 - Upper Receiver: DISSENT 9mm 7075 T6 Aluminum - Lower Receiver: Mk17 Forged 7075 T6 Aluminum - Hand Guard: CMMG 5.5 Proprietary - Finish: Cerakote - Charging Handle: DISSENT Side Charger -Left - Pistol Grip: CMMG ZEROED Pistol Grip - Receiver Extension: 1913 Picatinny Rail End Cap - Trigger Type: TriggerTech AR-D 2-Stage - Trigger Guard: Integrated - Safety Selector: CMMG ZEROED 60/90 Degree - Magazine: (2) Sig Sauer P320 21rd - Weight: 4.9 lbs - Length: 14.7