Description

M4E1 Threaded 11.5″ 5.56 Barrel Complete Upper Receiver w/ 9″ M-LOK ATLAS S-ONE Handguard

This complete upper includes our new ATLAS S-ONE Handguard! The S-ONE line of handguards are designed with size and weight in mind, providing the perfect addition to your lightweight build. 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
• 9″ ATLAS S-ONE M-LOK Handguard
• 11.5″ 5.56 CMV Barrel, Carbine Length
• 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 S-ONE Handguard Features:

• Front and rear picatinny rail
• Eliminated center of top rail for weight reduction
• Indexing grooves in 12:00 position for positive grip control
• 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

11.5″ 5.56 Barrel Features:

• 5.56 Nato 11.5″ Barrel, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled
• Government Profile
• .750 gas block journal
• Carbine length gas system, .0785 gas port
• M4 Feed Ramp Extension
• HP and MPI tested
• Standard A2 flash hider

• Shipping to FFL Dealer Required No
• Made in the USA
• Platform AR15
• Complete Upper Series M4E1
• Caliber 5.56 NATO
• Barrel Length 16
• Weight (oz) 12″ KeyMod – 53.44 oz / 12″ M-LOK – 53.44 oz / 12″ Quad Rail – 55.68 oz / 15″ KeyMod – 55.04 oz / 15″ M-LOK – 55.04 oz / 15″ Quad Rail – 57.60 oz