The Aero Precision M4E1 with 16-inch barrel is the flagship complete rifle from one of the most respected AR manufacturers in the industry. The M4E1 receiver features an integrated trigger guard and a wider flare at the magazine well for easier mag changes. Paired with an Aero ATLAS R-ONE handguard and a mid-length gas system, it delivers outstanding value and accuracy. Aero's quality control rivals builders charging twice the price. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2015, USA Weight: 62 oz Overall length: 32.5" Status: Active Intended use: Home Defense, Patrol Rifle, Competition