M4E1 Threaded Complete Upper, 11.5" 5.56 Carbine-Length Barrel w/ 10.3" R-ONE M-LOK Handguard - Black/OD Green

This complete upper includes our 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 Aero Taper Lock Attachment System is a durable and dependable mounting platform, maintaining a modern, slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards. Includes: M4E1 Threaded Assembled Upper Receiver - Anodized Black 10.3" R-ONE M-LOK Handguard - OD Green Cerakote 11.5" 5.56 CMV Barrel, Carbine Length Low Profile Gas Block and Carbine Length Gas Tube Product comes assembled This complete upper does not include BCG or Charging Handle. These products may be selected as add-ons under the Finish Your Build tab 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 R-ONE Handguard 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 11.5" 5.56 Barrel Features: 5.56 NATO 11.5" Barrel, 1:7 Twist Rate, 4150 CrMoV, QPQ Mid-Length Barrel Carbine Gov Profile .750 gas block journal Carbine length gas system, .0785 gas port M4 Feed Ramp Extension HP and MPI tested Standard A2 flash hider