Aero Precision M4E1 Threaded 18" .223 Wylde SS QPQ Complete Upper Receiver with 15" M-LOK ATLAS R-ONE Handguard - Anodized Black

Aero Precision M4E1 Threaded 18" .223 Wylde SS QPQ Complete Upper Receiver with 15" M-LOK ATLAS R-ONE Handguard - Anodized BlackThis complete upper features the best of the best, including a fluted accuracy-enhancing 223 Wylde chambered and QPQ-treated stainless steel barrel, the acclaimed ATLAS R-ONE Handguard, and the ever-popular and stylish M4E1-Threaded upper receiver.Fire match accurate 223 Remington specification ammunition while maintaining the safety and reliability capability of 5.56 NATO specification ammunition, a winning combo at whatever contest you enter.M4E1 Threaded Upper Features New enhanced forging that gives the upper receiver a "billet look" New picatinny profile that blends seamlessly with our Enhanced Series Handguards M4 Feedramps .250" takedown pin holes Laser-engraved T-marks Includes port door and forward assist installedATLAS R-ONE Handguard Features Full top picatinny rail for optional attachments Quick disconnect sling socket at the 3, 6, and 9 o'clock positions Compatible with low-profile gas blocks 1.3" Inside diameter 1.5" Outside diameter Compatible with mil-spec AR15 upper receivers and barrels Learn More about our NEW ATLAS Handguards18" .223 Wylde Barrel Features .223 Wylde 18" Rifle Length Barrel, 1/8 Twist QPQ Corrosion-Resistant Finish .750 gas block journal Rifle-length gas system M4 Feed Ramp Extension HP and MPI tested Standard A2 flash hider