The MK12 Upper Receiver from Daniel Defense is built around an 18" stainless steel barrel, engineered with a rifle-length direct impingement gas system and utilizing the MK12 gas block, which is built to Crane Specifications for USSOCOM. The Daniel Defense MK12 Upper Receiver features a rugged hard coat anodized Mil-Spec aluminum upper with a hammer forged stainless steel 18" barrel in a 1-7 twist with a MK12 profile.
- MK12 low profile gas block machined from 416 hardened steel, rifle length
- Daniel Defense 17-4 PH stainless steel flash suppressor
- Chrome Lined M16 profile bolt carrier group
- 6061-T6 hard coat anodized 12" Daniel Defense DDM4 Rail
