Platform | Mk4 |
Caliber | .338 ARC |
Operating System | Compact Action-Direct Impingement |
Barrel Length | 10.5 |
Barrel Twist | 1:8 |
Barrel Contour | MT |
Barrel Material | 4140CM, Nitride Finish |
Barrel Twist | 1:8 |
Muzzle Device | CMMG ZEROED Linear Compensator |
Muzzle Thread | 5/8 x 24 |
Gas Port Location | Pistol |
Gas Block | Non-Adjustable 0.750" |
Upper Receiver | Mk4 Billet 6061 T6 Aluminum |
Lower Receiver | Mk4 Forged 7075 T6 Aluminum |
Hand Guard | EML9 |
Finish | Cerakote |
Charging Handle | CMMG ZEROED Ambi |
Pistol Grip | CMMG ZEROED Pistol Grip |
Stock / Brace | CMMG RipStock |
Trigger Type | ZEROED Drop-In Single Stage |
Safety Selector | CMMG ZEROED 60/90 Degree |
Magazine | (1) 10 rd CMMG 338 ARC |
Weight | 5.6 lbs |
Length | 26.5" |








Due to high demand, some of our parts and accessories may be on backorder and have an extended lead time. Items currently on backorder can still be purchased. Expected to ship in 4 to 6 weeks.
SBR, BANSHEE, Mk4, 338 ARC, 10.5"
With a large bore and a short length, the 338 ARC BANSHEE SBR delivers more energy on target and greater stopping power than 300 BLK while still being part of the AR15 platform, no matter if you prefer subsonic or supersonic ammo. A 1:8 barrel twist rate allows the use of a wide variety of 338 projectiles, from traditional lead core to monolithic.