Aero Precision's M4E1 in .300 Blackout with 8-inch barrel is the ideal suppressor host in the AR pistol format. The short barrel maximizes .300 BLK subsonic load performance, and the pistol-length gas system is tuned for reliable cycling with both supersonic and subsonic ammunition. The M4E1 enhanced receiver and ATLAS handguard bring Aero's quality to the suppressor-host pistol segment. Type: Pistol Action: Semi-Automatic Caliber: .300 Blackout Capacity: 30 Year introduced: 2018, USA Weight: 54 oz Overall length: 24" Status: Active Intended use: Suppressor Host, Home Defense, Duty Use