Aero Precision M4E1 Enhanced with upgraded components including Aero ATLAS S-ONE handguard and enhanced BCG. Step up from base M4E1. Type: Semi-Auto Rifle Action: Semi-Automatic Caliber: 5.56x45mm Capacity: 30 Year introduced: 2019, USA Weight: 63 oz Overall length: 32.5" Status: Active Intended use: General Purpose