Aero Precision M4E1-T Complete Upper, 12.5" 5.56 Barrel, RM12.7 - Ano

SKU: APAR700704M30
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Aero Precision M4E1-T Complete Upper, 12.5″ 5.56 Barrel, RM12.7 – Ano

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


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


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
12.5″ 5.56 CMV Carbine Length Barrel


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

Product Information


Aero Precision




5.56 NATO

Coating Type

Black Anodize

Gas System


Gas Block Diameter


Attachment Type


Muzzle Thread


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