M16 full auto, complete bolt group assembly, gas key installed, carrier chrome plated internally. Bolt carrier group for your AR15 or M16. Manufactured and assembled by USGI Contractor DS Arms. Completely assembled, includes bolt carrier, bolt, firing pin, cam pin, and retaining pin. FeaturesBolt9310 Super Alloy Steel (7% stronger than Carpenter No. 158® Steel)MPI Bolt (Magnetic Particle Inspected)Hardened Steel ExtractorHeavy Duty Extractor SpringBlack Extractor InsertMil-Spec O-RingMilspec Gas rings (3)Parkerized exterior
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