The J P Enterprises 6.5 Grendel / 6mm ARC Full Mass Bolt Carrier Group offers a precision-machined, enhanced, stainless bolt-and-carrier group made of high-grade 9310 steel providing a significantly longer life expectancy than standard mil-spec bolts. The 6.5 Grendel / 6mm ARC Full Mass Bolt Carrier Group replicates the normal carrier weight and is preferred for duty rifles or any time absolute reliability is required. Standard weight carrier features a 100% increase in bearing surface for smoother cycling and reduced wear on the inside of the receiver. The J P Enterprises BCG features a super-hard QPQ finish for maximum wear resistance and minimal friction. Extractor, firing pin, and all other components are included.