Start your build off right with the MKII version of the GGP-S Series which brings a level of customizability never before seen in our rifle receivers. The billet receivers are precisely machined from 7075-T6 aluminum for a perfect fit. The lower receiver includes GGP's ambidextrous bolt release as a standard feature, as well as a flared magwell and integral trigger guard. Tighter than Mil-Spec tolerance, the receiver set functions with nearly all available DPMS pattern large frame parts.