Daniel Defense AR Bolt Assembly 5.56mm. 56 NATO (5.56x45mm & .223 Remington) / 300 Blackout (7.6x35mm) Bolt Assembly. Specifications for Daniel Defense AR Bolt Assembly 5.56 NATO / 300 Blackout: Manufacturer: Daniel Defense Color: Black Fabric/Material: Steel Features of: Carpenter 158 Steel High Pressure Tested Magnetic Particle Inspected Shot Peened Bolt Heavy Phosphate Coated Extractor Booster Product Weight - 1.6 oz Package Contents: Daniel Defense AR Bolt Assembly 5.56 NATO / 300 Blackout Daniel Defense Warranty: Guaranteed Satisfaction All Daniel Defense products carry a 100percent 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. Daniel Defense AR Bolt Assembly 5.56mm