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If you're searching for a bolt that can handle a .45 ACP pistol-caliber carbine, then the Stern Defense AR-15 SD-BU45 Bolt Carrier is purpose-built for you. It's designed to provide reliable, dependable, and durable operation needed for big-bore PCCs.

The Stern Defense AR-15 SD-BU45 Bolt Carrier is made from 8620 AISI steel and has a 4140 billet-steel extractor ensuring that each round is ejected successfully. It also features a Glock cut and is treated with a manganese-phosphate finish. The bolt carrier is compatible with mil-spec and Glock-pattern AR-15 upper receivers and works with standard AR-15 charging handles. The carrier comes with the firing pin, spring, retaining pin, extractor, and extractor spring.

One of the great features of the Stern Defense AR-15 SD-BU45 Bolt Carrier is the new bolt design that's even compatible with single-stage triggers that have short resets. The bolt works with both the Law Tactical folding-stock adapter and the Echo trigger. It's essential to use the bolt with an 11-ounce, or heavier buffer, and the upper receivers should have an enlarged ejection port that can accommodate the large-diameter brass cartridge. While the bolt is compatible with JP Silent Capture springs, it's not recommended for use because .45 ACP may damage the JP system.