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Non neutered M 16 complete bolt carrier group assembly. The real deal. The good stuff period! A BCG that is made the finest way possible. Manufactured with quality by LMT. Standard Full-Auto Bolt Carrier Group Complete, SPECS Caliber 6.8 SPC, .204 Ru, 5.56x45, .300 Blk Operating Method Direct Impingement Weight (empty) 0.716 Pounds / 0.32 Kilograms Selector Safe/Semi/Select Color Black DETAILS Full Auto Bolt Carrier Group, 5.56×45 (.223) The L7D3 is the perfect BCG for a Mil-Spec build or upgrade from sub-par equipment. LMT Defense has made the full-auto M16/M4 BCG and its components for years replacement parts for the United States hard work war fighters and other that need reliable equipment. These BCG’s are standard equipment in all of our complete full auto weapon systems. Works well with both suppressed and unsuppressed weapon systems.