Product Description The Spike&';s Tactical Lightweight M16 Bolt Carrier Group (BCG) is a critical upgrade for AR-pattern builds where reliability and reduced reciprocating mass matter. Finished with a Nickel Boron coating on the bolt, carrier, and gas key, this complete BCG is designed for smoother cycling and easier cleanup. The lightweight, reduced-mass design features machining cuts to help trim weight, and it is laser engraved with the Spike&&';;s Tactical "ST" spider logo for quick identification. Product Highlights Nickel Boron coating inside and out (bolt, carrier, and gas key) for enhanced lubricity and easier cleaning Lightweight, reduced-mass design with weight-reduction machining cuts M16 profile bolt carrier group for AR-pattern rifles (does not convert an AR-15 to full auto) High pressure tested (HPT) and magnetic particle inspected (MPI) bolt for added confidence Laser engraved with the Spike&&';;s Tactical ST spider logo Specs Brand: Spike&';s Tactical Manufacturer Part Number: ST5BG05 UPC: 855319005518 Type: Complete bolt carrier group (BCG) Profile: M16 Finish/Coating: Nickel Boron (bolt, carrier, and gas key) Testing: HPT/MPI bolt Bolt Material: Carpenter 158 steel Carrier/Gas Key Material: 8620 tool steel Weight: 10.5 oz Fitment (as listed): .223 Rem / 5.56 NATO / .300 Blackout Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&&';;s manufacturer.