Building an AR in a larger caliber like .308 Win doesn’t mean you have to sacrifice portability. The BANSHEE Mk3 upper group chamber in .308 Win is just the thing to complete the go anywhere .308 AR10. The CMMG Mk3 platform is based on the popular DPMS Gen 1 high-pattern LR308 design. All CMMG Upper Groups come complete with bolt carrier group and ZEROED accessories including :