Aero Precision AR-15 M4E1-E Complete Upper Assembly 5.56x45mm NATO 8" Barrel 7.3" ATLAS R-ONE Handguard Flat Dark Earth

Aero Precision APAR700711M102: This complete upper includes Aero Precision\'s 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. This complete upper does not include BCG or Charging Handle INCLUDES: M4E1 Threaded Assembled Upper Receiver 7.3\" M-LOK ATLAS R-ONE Handguard 8\" 5.56 Pistol Length CMV Barrel Low Profile Gas Block and Pistol Length Gas Tube Product comes assembled The muzzle brake that comes with this complete upper receiver is NOT pinned nor welded to this barrel. 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 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 8\" 5.56 PISTOL LENGTH BARREL FEATURES: Chamber: 5.56 Length: 8\" Twist: 1 in 7 Threading: 1/2\"x28 Material: Chrome Moly Vanadium Finish: QPQ corrosion resistant finish both inside and out Gas Block: .750 Gas System Length: Pistol Weight: 17.76 oz M4 Barrel Extension HP and MPI Tested