The Stern Defense STERN DEF. BOLT .45ACP BU45 is a precision AR-15 .45ACP bolt crafted from 8620 AISI steel and finished in mag-phosphate for rugged reliability and corrosion resistance, proudly Made In The USA. Designed for AR .45ACP compatibility, this bolt delivers dependable cycling and consistent lockup essential for practical handgun-caliber builds, enhancing reliability in rifles configured for .45 ACP ammunition. With a compact 2.30 x 2.35 x 9.35 inch profile, it integrates smoothly into compatible upper receivers, providing a seamless fit for enthusiasts seeking a dedicated .45ACP bolt option without compromising performance or safety. The Type/color specification, AR-15 .45acp Bolt, communicates its intended application and aesthetic, while the .45acp/mag-phosphate finish helps resist wear during repeated magazine changes and high-volume shooting. Ideal for range day drills, varmint control, or predator management where .45ACP power and handgun-caliber ergonomics are advantageous, this bolt supports reliable feeding and extraction in tuned AR platforms. Trust in Stern Defense to deliver a robust, American-made component that maximizes the versatility of your AR-15 .45ACP build.