Spike's Tactical, STLS033 Waterboarding, Stripped Lower, Semi-automatic, 223 Rem/556NATO, Black Finish, Non-Color PRODUCT SPECIFICATIONS UPC Code: 815648028343 Manufacturer: Spike's Tactical Manufacturer Part #: STLS033 Model: STLS033 Model: Waterboarding Action: Semi-automatic Type: Lower Caliber: 223 Rem Caliber: 556NATO Barrel Length: N/A Finish/Color: Black Grips/Stock: N/A Description: Non-Color Subcategory: Lower Receivers