Aero Precision M4E1 18 in 5.56 Rifle Length Assembled Upper Receiver Black

The M4E1 5.56mm 18" Rifle Upper Receiver adds two important benefits to Aero Precision's M4E1 carbine upper. First, the longer 18" barrel imparts extra velocity to the bullet with a very small addition to the rifle's OAL. Second, the longer rifle-length gas system slows down gas velocity for gentler cycling that leads to improved reliability and reduced wear on moving parts and the receiver. The result? Rifle-like performance - and versatility - in a carbine-sized package. The Aero Precision M4E1 5.56mm 18" Rifle Upper Receiver delivers all the other benefits of Aero's M4E1 receiver line. The bolt/carrier group and charging handle are omitted so you c Mfg: Aero Precision