Aero Precision's M4E1 Enhanced in .300 Blackout combines the premium Enhanced designation (Geissele trigger, upgraded furniture) with the suppressor-optimized .300 BLK cartridge. The 16-inch barrel and M4E1 Enhanced receiver set create a refined suppressor host for users who want quality components without building from parts. One of the best factory .300 BLK complete rifles in the mid-tier segment. Type: Rifle Action: Semi-Automatic Caliber: .300 Blackout Capacity: 30 Year introduced: 2019, USA Weight: 64 oz Overall length: 32.5" Status: Active Intended use: Suppressor Host, Home Defense, Competition