300BLK was practically designed to be suppressed and the ZEROED BANSHEE Mk4 Suppressed Upper Group leans into that heritage completely. – Running on Direct Impingement the 6.5 barrel pairs naturally with the included ZEROED 30 suppressor which tucks neatly inside the oversized dad bod-ish 11 M-LOK handguard. – Compatible with standard Mk4/AR15 lower receivers this upper group is the easiest way to turn any Mk4 lower into a purpose-built suppressed .300 BLK platform. – Specifications – Platform Mk4 – Caliber .300 BLK – Operating System Direct Impingement – Barrel Length 6.5 – Barrel Twist 1:07 – Barrel Contour MT – Barrel Material 4140CM Nitride – Muzzle Device ZEROED 30 – Muzzle Thread 5/8 x 24 – Gas Port Location Pistol – Gas Block .750 Adjustable – Upper Receiver Mk4 Billet 6061 T6 Aluminum – Hand Guard 11 M-LOK (accepts up to 1.5 diameter suppressors) – Finish Cerakote – Charging Handle CMMG ZEROED Ambi – Weight 4.3 lbs – Length 19.5