OSA Premium Upper Parts Kit OSA Premium Upper Parts Kit (UPK) The OSA Premium Upper Parts Kit includes the highest-quality components needed to complete your AR-15 upper receiver. Manufactured in the USA by Forward Controls Design (FCD), this kit replaces standard mil-spec... MSRP: Was: Now: $125.00 Choose Options
OSA15 AR15 Upper receiver (Thermal Fit) OSA15 AR-15 Upper Receiver (Thermal Fit) The OSA15 Thermal Fit Upper Receiver is built for shooters who want the tightest possible receiver fit without relying on tension screws or oversized takedown pins. Machined from a 7075-T6 forged receiver... MSRP: Was: Now: $125.00 Choose Options
