Description

Includes:

M4E1 Threaded Assembled Upper Receiver

ATLAS S-ONE Handguard of choice

8″ .300 Blackout CMV Barrel

Low Profile Gas Block and Pistol Length Gas Tube

Product comes assembled

This complete upper does not include BCG or Charging Handle. 

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

8″ .300 Blackout Barrel Features:

Length: 8″

Twist: 1 in 7

Muzzle: 5/8×24 Threaded

Material: 4150 Crome Moly Vanadium

Finish: QPQ corrosion resistant finish both inside and out

Gas Block: .750

Gas Port: .109

Gas System Length: Pistol

Weight: 18oz

M4 Barrel Extension

HP and MPI Tested