Aero Precision's M4E1 in .450 Bushmaster is a straight-wall hunting AR-15 for restricted states. The M4E1 enhanced lower and ATLAS handguard bring Aero's quality to the large-bore hunting segment. The 16-inch barrel delivers effective .450 BM energy for deer hunting within typical hunting distances. One of the more premium factory .450 BM complete rifles in the market. Type: Rifle Action: Semi-Automatic Caliber: .450 Bushmaster Capacity: 5 Year introduced: 2020, USA Weight: 70 oz Overall length: 32.5" Status: Active Intended use: Hunting