Lower receivers form the serialized foundation of AR-15 patrol rifles trusted by law enforcement agencies nationwide. Officers building custom duty weapons or replacing damaged components need mil-spec receivers that accept standard parts and withstand the demands of patrol, active shooter response, and special operations. While brands like BCM are known for their forged lower receivers with reinforced trigger guards and improved magazine wells, departments also source receivers compatible with duty lights from manufacturers like Streamlight and optics from Aimpoint for complete mission-ready builds. Every lower receiver at OfficerStore meets the durability and compatibility standards police armorers and officers demand for department-issued and personally owned patrol rifles.