RIFLE: AERO PRECISION MODEL M4E1 RIFLE, SERIAL NUMBER M4-0016673, BLACK (MATTE), CASE NOT INCLUDED, SEMI - AUTOMATIC, MULTI, 11IN Notes: This item is an Aero Precision M4E1 rifle, serial number M4-0016673, finished in black (matte). The rifle is configured as semi-automatic and multi-caliber, with an 11-inch barrel. The configuration includes a BRN-180 upper assembly and MGPCQB sights. Case is not included. Detailed Description Manufacturer: Aero Precision Model: M4E1 Serial Number: M4-0016673 Type: Rifle Action: Semi-automatic Caliber: Multi Barrel Length: 11 inches Finish/Color: Black, matte Upper Assembly: BRN-180 Sights: MGPCQB Case: Not included Condition: Good