Product DescriptionThe Stern Defense .45 ACP bolt assembly is built from durable 8620 AISI steel and finished in Mag-Phosphate for dependable performance and corrosion resistance. Designed to fit Mil-Spec and Glock-pattern upper receivers, it functions with Colt SMG and Glock magazines and is fully compatible with standard AR-15/M16 charging handles. This bolt comes fully assembled with key sub-components installed, including the firing pin, spring, retaining pin, extractor, and extractor spring, plus proprietary center and roll pins. The updated .45 bolt design is engineered to cater to single-stage triggers with short resets.Product Highlights 8620 AISI steel construction with Mag-Phosphate finish for strength and durability Fits Mil-Spec and Glock-pattern upper receivers for .45 ACP AR-platform builds Functions with Colt SMG and Glock magazines for versatile feeding options Compatible with standard AR-15/M16 charging handles Ships fully assembled with firing pin, extractor components, and proprietary pins installed Specs Brand: Stern Defense Manufacturer Part Number: 004SDBU45D1M UPC: 850001176057 Caliber: .45 ACP Platform Compatibility: AR-15/M16 Upper Receiver Fit: Mil-Spec and Glock-pattern upper receivers Magazine Compatibility: Colt SMG and Glock magazines Charging Handle Compatibility: Standard AR-15/M16 Material: 8620 AISI steel Finish: Mag-Phosphate Included/Installed Components: firing pin, firing pin spring, retaining pin, extractor, extractor spring, proprietary center and roll pins Trigger Compatibility Note: updated design caters to single-stage triggers with short resets 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.