Aero Precision 5.56 NATO M4E1 ATLAS R-ONE Complete Upper
Available in 10.5″ Carbine or 16″ Mid-Length
Aero Precision 5.56 NATO M4E1 ATLAS R-ONE Complete Upper is the most efficient way to assemble your 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 for the 10.5″ barreled model.
**The muzzle devices are 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
5.56 Barrel Features:
- Select between a 10.5″ Carbine or 16″ Mid-Length barrel
- 5.56 NATO 1/7 twist, 4150 CrMoV, QPQ, gas port drilled
- .750 gas block journal
- Carbine length gas system (10.5″) | Mid-Length Gas (16″)
- .0785 gas port
- M4 Feed Ramp Extension
- HP and MPI tested
- Standard A2 flash hider
Choose between 2 Configurations:
APAR700702M2 – 10.5″ Carbine w/ 9″ ATLAS R-ONE MLOK
APAR700705M7 – 16″ Mid w/ 15″ ATLAS R-ONE MLOK
- M4E1 Threaded Assembled Upper Receiver
- M-LOK ATLAS R-ONE Handguard
- 10.5″ or 16″ 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 with this complete upper receiver is NOT pinned nor welded to this barrel.
|Gas Block Diameter||
Arm or Ally is a stocking dealer for all Aero Precision, Faxon Firearms, Ballistic Advantage, HOLOSUN, Toolcraft, Elftmann Tactical, Timney, TriggerTech, HIPERFIRE and named the #1 Overall E-Commerce Dealer for Aero Precision Products in 2020!