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Wilson Combat, Upper/Lower Receiver, Semi-automatic, 223 Rem/556NATO, Black Finish, Mil-spec PRODUCT SPECIFICATIONS UPC Code: 000000000000 Manufacturer: Wilson Combat Manufacturer Part #: TR-LOWUPP Model: Upper/Lower Receiver Action: Semi-automatic Type: Lower Caliber: 556NATO Caliber: 223 Rem Barrel Length: N/A Finish/Color: Black Grips/Stock: N/A Description: Mil-spec