Spike's Tactical, STLS033-CFA Waterboarding, Semi-automatic, 223 Rem/556NATO, Black Finish, Color Filled PRODUCT SPECIFICATIONS UPC Code: 815648028633 Manufacturer: Spike's Tactical Manufacturer Part #: STLS033-CFA Model: Waterboarding Model: STLS033-CFA Action: Semi-automatic Type: Lower Caliber: 223 Rem Caliber: 556NATO Barrel Length: N/A Finish/Color: Black Grips/Stock: N/A Description: Color Filled Subcategory: Lower Receivers