RIFLE: AMERICAN TACTICAL - ATI MODEL MIL-SPORT AR - RIFLE, SERIAL NUMBER MSA160140, BLACK (MATTE), CASE NOT INCLUDED, SEMI - AUTOMATIC, 5.56MM, 20IN Notes: The American Tactical (ATI) Model MIL-SPORT AR Rifle is a semi-automatic rifle chambered in 5.56mm, featuring a black matte finish and a 20-inch barrel. This example is identified by serial number MSA160140. A case is not included. The description and specifications below are based on the information provided and should be verified against the firearm and accompanying documentation. Manufacturer: American Tactical (ATI) Model: MIL-SPORT AR Rifle Firearm Type: Semi-automatic rifle Caliber: 5.56mm Finish: Black (matte) Serial Number: MSA160140 Barrel Length: 20 in. Case: Not included Condition: Very Good