Product Description The Battle Arms Development BAD-BCG-M16 Bolt Carrier Group is a full-auto rated, black nitride-finished BCG designed for AR-15/M16/M4 platforms chambered in .223 Remington, 5.56 NATO, and 300 Blackout. Built with durable, billet-machined components and a corrosion-resistant black nitride surface treatment, it delivers smooth cycling, enhanced wear resistance, and reduced lubricant dependence for hard-use reliability. Product Highlights Black nitride finish provides an ultra-hard, corrosion-resistant surface for wear resistance and easier maintenance 8620 steel, case-hardened bolt carrier machined from billet for strength and consistency 9130 steel bolt is shot peened and black nitride finished; MPI/HPT for confidence in demanding use Properly staked 4140 steel gas key with Grade 8 fasteners helps maintain gas seal integrity Premium small parts including 17-4 H-900 firing pin and 4140 cam pin/extractor components Specs Product Type: Bolt Carrier Group (BCG), full-auto rated Platform Fit: AR-15 / M16 / M4 Compatible Calibers: .223 Remington / 5.56 NATO / 300 Blackout Operating System: Direct Impingement Finish: Black Nitride Bolt Carrier: 8620 steel, case hardened, machined from billet Bolt: 9130 steel, shot peened; CNC ground after heat treat; Black Nitride; MPI/HPT Gas Key: 4140 steel, machined from billet; Grade 8 screws; properly staked Firing Pin: 17-4 H-900 steel, center-less ground Cam Pin: 4140 hardened steel Extractor: 4140 billet; manganese phosphate finished Forward Assist Serrations: Yes Manufacturer Part Number: BAD-BCG-M16 UPC: 810033781155 Listed Dimensions: 11.0000 in (L) x 4.0000 in (W) x 2.0000 in (H) Listed Weight: 1.0000 lb Brand: Battle Arms Development 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.