AERO PRECISION M4E1 5.56 ATLAS R-ONE Complete Upper 10.5" BLK

High quality Complete Upper Receiver with Bolt Carrier Group and Charging Handle. This complete upper includes our new ATLAS R-ONE Handguard! The R-ONE handguards are designed with size and weight in mind, while still providing plenty of real-estate to accommodate any attachment needs the end user may have. Our proprietary ATLAS attachment system is a durable and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards. Includes: M4E1 Threaded Assembled Upper Receiver Included Phosphate BCG, with Chrome lined gas key and bolt channel Included Charging Handle Included A2 Flash Hider ATLAS R-ONE M-LOK Handguard 10.5" 5.56 Nato/.223 REM CMV Barrel Low Profile Gas Block and Carbine Length Gas Tube Product comes assembled M4E1 THREADED UPPER RECEIVER 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 installed Finish: Matte black hard-coat anodized Mil 8625 Type 3 Class 2 ATLAS 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 Finish: Matte black hard-coat anodized Mil 8625 Type 3 Class 2 10.5" 5.56 Nato/.223 REM Barrel Features: Twist: 1 in 7 Muzzle: 1/2x28 UNEF Threaded Material: 4150 Crome Moly Vanadium Finish: QPQ corrosion resistant finish both inside and out Gas Block Journal: .750 Gas Port: .0785 Gas System Length: Carbine M4 Barrel Feed Ramp Extension HP and MPI Tested Informations: Included C.I.P. No pinned or welded Muzzle Device Compatible with AR-15 MIL-SPEC Lower Receivers MADE IN THE USA