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Howard, This M5 receiver is crafted from precision machined 7075-T6 aluminum with a flat dark earth Cerakote finish. The lower works with standard DPMS 308 components and LR-308/SR-25 magazines. The lower is Cal Multi marked and the selector markings will work with 45, 60 or 90 degree throw safety selectors. The rear takedown pin hole is threaded for a 4-40 set screw and it includes a nylon tipped upper tension screw. This receiver can be used with any standard AR-308 caliber build including, .243 Winchester, 6.5 Creedmoor, and .308 Winchester or 7.62x51mm NATO.
This has a bolt catch that is threaded for a screw pin (no roll pin needed).
