Aero Precision M4E1 5.56 NATO 7.5″ ATLAS R-ONE Complete Upper is the most efficient way to assemble your own custom firearm; fully assembled and warrantied by Aero Precision. The R-ONE handguards are designed with size and weight in mind, providing the perfect addition to your lightweight build. Aero Precision’s 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.
*NFA Rules apply!
**The muzzle device is NOT pinned nor welded to the barrel.
***Does not include Bolt Carrier Group or Charging Handle.
M4E1 Threaded Upper Receiver Features:
- New enhanced forging that gives the upper receiver a “billet look”
- M4 Feed ramps
- .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
7.5″ 5.56 Pistol Length Barrel Features:
- Material: Chrome Moly Vanadium
- Finish: QPQ Corrosion resistant finish both inside and out.
- Gas System: Pistol Gas w/ .750 Journal
- Weight: 17.25oz
- Other: M4 Extension | HP and MPI Tested
- Standard A2 flash hider
- M4E1 Threaded Assembled Upper Receiver
- M-LOK ATLAS R-ONE Handguard
- 7.5″ 5.56 CMV Barrel
- Low Profile Gas Block and Gas Tube
- Product comes assembled
- This complete upper does not include BCG or Charging Handle.
- The muzzle brake that comes with this complete upper receiver is NOT pinned nor welded to this barrel.