M4E1 15" ATLAS R-ONE M-LOK Complete Upper, 16" 5.56 HBAR CMV Mid-Length Barrel - Anodized Black

This complete upper receiver incudes an HBAR profile barrel that is laser marked "HBAR". Includes: M4E1 Assembled Upper Receiver 15" ATLAS R-ONE M-LOK Handguard 16" 5.56 HBAR barrel Low Profile Gas Block and Mid-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. M4E1 Upper Features: Forged from 7075 T6 aluminum Precision machined to M4E1 specs M4 feedramps Matte black hard coat anodized Mil 8625 Type 3 Class 2 Laser engraved T-marks Comes assembled, with port door and forward assist installed Accepts standard AR15/M16 components Handguard mounting platform is forged into the receiver Works with Aero Precision handguards but also fits most BAR-system handguards Barrel nut and wrench are included 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 1.3" Inside diameter 1.5" Outside diameter Compatible with mil-spec AR15 upper receivers and barrels MLOK attachment points 16" 5.56 HBAR Barrel 5.56 Nato 16" Barrel, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled .750 gas block journal Mid-Length Gas System M4 Feed Ramp Extension HP and MPI tested Standard A2 flash hider