Epc-9 9mm/40 S&w Assembled Upper Receiver W/lrbho Black

The Epc-9 9mm/40 S&W Assembled Upper Receiver with LRBHO (Last Round Bolt Hold Open) from Aero Precision represents a purpose-built platform for operators and competitive shooters who demand reliability in 9mm and 40 S&W calibers. This upper receiver assembly eliminates the guesswork of component selection and fitment, arriving factory-assembled and ready for installation onto a compatible lower receiver. Built to exacting mil-spec tolerances, it serves law enforcement, military personnel, and civilian tactical users who require a drop-in solution for precision and consistency.

The integrated Last Round Bolt Hold Open feature automatically locks the bolt to the rear when the final round exits the magazine, eliminating the need for manual bolt catch manipulation and providing immediate tactile and visual feedback that the magazine is empty. Aero Precision's machining and assembly standards ensure tight tolerances between the barrel extension, bolt carrier group interface, and receiver rails—critical for sustained accuracy and reliable cycling under rapid fire conditions. At 1.1 pounds, this upper receiver strikes a practical balance between durability and controllability, making it ideal for both stationary marksmanship and dynamic tactical applications where weight matters.

This assembled upper receiver is compatible with AR-pattern lower receivers chambered for 9mm or 40 S&W and integrates seamlessly into modern carbine or pistol-caliber carbine (PCC) builds. Installation requires only pin alignment and a pivot pin—no gunsmithing necessary. Law enforcement agencies operating 9mm duty carbines, competition shooters in PCC divisions, and home-defense-focused builders will find this upper receiver accelerates build timelines while guaranteeing component harmony. The black anodized finish resists corrosion and blends with tactical configurations, and the LRBHO function is especially valued in low-light or gloved-hand environments where manual bolt manipulation may be impractical.