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M4E1 Threaded 10.5" 5.56 Complete Upper Receiver w/ ATLAS R-ONE Handguard

M4E1 Threaded 10.5" 5.56 Complete Upper Receiver w/ ATLAS R-ONE Handguard

SKU: A10.5

THIS ITEM IS IN STOCK AT OUR WAREHOUSE. By purchasing this item you understand it will ship in approximatley 3-5 days, at the discretion of the mail services and their delivery rates. Please feel free to reach out with any questions via call/text/ or email.



This complete upper includes our new ATLAS 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 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.



M4E1 Threaded Assembled Upper Receiver

ATLAS S-ONE Handguard of choice

10.5" 5.56 CMV Barrel

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:

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

Learn More about our NEW ATLAS Handguards


10.5" 5.56 Barrel Features:

5.56 Nato 10.5" Barrel, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled

.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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