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M4E1 Threaded 12.5" 5.56 Carbine Length Complete Upper Receiver w/ ATLAS R-ONE

M4E1 Threaded 12.5" 5.56 Carbine Length Complete Upper Receiver w/ ATLAS R-ONE


Text / Email for best price :) 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 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

12.7" M-LOK ATLAS R-ONE Handguard

12.5" 5.56 Government Profile CMV Barrel, Carbine Length

Low Profile Gas Block and Carbine Length Gas Tube

AR15 A2 Birdcage Flash Hider

Product comes assembled

This complete upper does not include BCG or Charging Handle.

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

12.5" 5.56 CMV Carbine Length Barrel Features:

Chamber: 5.56

Length: 12.5"

Twist: 1 in 7

Threading: 1/2"x28

Material: Chrome Moly Vanadium

Finish: QPQ corrosion resistant finish both inside and out

Gas Block: .750

Gas System Length: Carbine

Weight: 22oz

M4 Barrel Extension

HP and MPI Tested

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