M4e1 Assembled Upper Receiver .223 Wylde Black - M4e1 223 Wylde Assembled Upper Rcvr M4 16''''bbl Mid-Length Blk
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M4e1 Assembled Upper Receiver .223 Wylde Black - M4e1 223 Wylde Assembled Upper Rcvr M4 16''''bbl Mid-Length Blk, Aero Precision's M4E1 .223 Wylde Upper Receiver provides rifle-like performance - and versatility - in a carbine-sized package. It features a .223 Wylde chamber that is optimized to deliver excellent performance from both military 5.56x45mm NATO and civilian .223 Remington ammunition, including long, heavy (up to 80 grain) target bullets. Aero put a longer gas tube on the M4E1 .223 Wylde Assembled Rifle Receiver to slow down gas velocity for gentler cycling that leads to improved reliability and reduced wear on moving parts and the receiver. The 16" barreled model comes with a Mid-Length gas system, while the 18" barrel comes with a Rifle-Length gas tube. The M4E Mfg: Aero Precision