Description
Perfect for building your custom Mk3/High Pattern LR-308 upper group. Comes with a properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced. Made of 416 Stainless Steel with a Nitride Finish.
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CMMG 57D400F Barrel Sub-Assembly MT 5.7x28mm 16.10" 4140CM Barrel
UPC # 815835019826