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Spike's Tactical Complete Bolt Carrier Group. Complete with Bolt Carrier, Bolt and Firing Pin. , Chrome Lined, Military Spec. Heavy Phosphate Coated, and feature a properly staked gas key. BCGs are machines from Carpenter 158 Steel. Gas Keys are also hardened. HPT/MPI Bolt These are the heavier M16 Bolt Carrier group and will work with any semi auto or full auto AR15 or M16. from Primary Arms (Product ST5BG01)

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