FEATURES: M4E1 Threaded Assembled Upper Receiver 9" ATLAS R-ONE M-LOK Handguard 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 ATLAS 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 Learn More about our NEW ATLAS S-ONE Hanguards 11.5" 5.56 Barrel Features: 5.56 Nato 11.5" Barrel, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled Government Profile .750 gas block journal Carbine length gas system, .0785 gas port M4 Feed Ramp Extension HP and MPI tested Standard A2 flash hider
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