RIFLE: RADICAL FIREARMS MODEL RF-15 - RIFLE, SERIAL NUMBER 24-113968, BLACK (MATTE), CASE NOT INCLUDED, 16", 5.56 NATO, SEMI - AUTOMATIC Notes: Rifle: Radical Firearms Model RF-15 Manufacturer: Radical Firearms Model: RF-15 Serial Number: 24-113968 Item Type: Rifle Finish: Black (Matte) Barrel Length: 16" Caliber: 5.56 NATO Action: Semi-Automatic Case: Not Included Quantity: 1 Rifle: Radical Firearms RF-15 - Semi-automatic rifle, Radical Firearms Model RF-15, serial number 24-113968. Black matte finish. 16-inch barrel. Chambered in 5.56 NATO. Firearm is listed as semi-automatic. Case not included.