Aero Precision M4e1 Almost Complete Upper 5.56mm, 16 " Barrel, 15 " Altlas R- One Mlok ™

This complete upper includes the 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.

Includes:
M4E1 Threaded Assembled Upper Receiver
15" ATLAS R-ONE Handguard
16" 5.56 CMV Barrel
Low Profile Gas Block and Mid Length Gas Tube
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 the 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:
Front and rear picatinny rail
Eliminated center of top rail for weight reduction
Full top picatinny rail for optional attachments
Quick disconnect sling socket at the 3, 6 and 9 o'clock positions
1.3” Inside diameter
1.5” Outside diameter
Compatible with mil-spec AR15 upper receivers and barrels
16" 5.56 M4 CMV Mid-Legnth Barrel Features:
5.56 Nato 16" Barrel, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled
.750 gas block journal
Mid length gas system
M4 Feed Ramp Extension
HP and MPI tested
Standard A2 flash hider