Daniel Defense 5.56 NATO (5.56x45mm & .223 Remington) / 300 Blackout (7.6x35mm) full-auto compatible, M16 Profile, complete Bolt Carrier Group BCG assembly. CARRIER Machined from 8620 steel Heavy Phosphate Coated Chrome lined Properly staked gas keys BOLT Machined from Carpenter 158 Steel High Pressure Tested Magnetic Particle Inspected Shot Peened Heavy Phosphate Coated Extractor Booster Specifications for Daniel Defense Bolt Carrier Group (BCG) Complete 5.56mm NATO: Manufacturer: Daniel Defense Finish: Phosphate Chrome Fabric/Material: Steel Cartridge: 5.56x45mm NATO Condition: New Weight: 11 oz Bolt Material: Steel Carrier Material: 8620 Steel Package Contents: Daniel Defense Daniel Def. Bolt Carrier Group Complete 5.56mm Nato Daniel Defense Warranty: Guaranteed Satisfaction All Daniel Defense products carry a 100% satisfaction guarantee against defects in original materials and workmanship. If your Daniel Defense product shows evidence of such defects, Daniel Defense will make every accommodation to fix, repair, or replace your product in the most expeditious manner possible. Daniel Defense does not warranty products or damage caused to our products by the correct or incorrect installation of other manufacturer's products. Warranty information and warranties are supplied solely by the manufacturer, and not this retailer. This retailer publishes information from the manufacturer for information purposes only, and the manufacturer is solely responsible and liable for any warranty information and warranties published by this retailer. Please reference the appropriate manufacturer documents or reach out to the manufacturer directly for full warranty terms and effective dates. @media screen and (max-width: 400px) { #w-block-one { display:table-row !important; } }