M4E1-Threaded Complete Upper, 11.5″ 5.56 BRL, 9″ M-LOK AR15 ATLAS S-ONE HG


This complete upper includes our new M-LOK 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.

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SKU: MAPP-ARUC-5300-AB Categories: , , , Tags: ,
M4E1-T Complete Upper, 11.5" 5.56 BRL, 9" M-LOK AR15 ATLAS S-ONE HG - Anodized Black


  • M4E1 Threaded Assembled Upper Receiver
  • 9" M-LOK AR15 ATLAS S-ONE Handguard
  • 11.5" 5.56 Rifle Length Barrel
  • Low Profile Gas Block and Rifle Length Gas Tube
  • Product comes assembled
  • This complete upper does not include BCG or Charging Handle. These products may be selected as add-ons - look at related products below

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

M-LOK 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
  • Learn More about our NEW ATLAS S-ONE Hanguards

11.5" 5.56 Rifle Length Barrel Features:

  • 5.56 Nato 11.5" Rifle Length Barrel
  • 4150 CrMoV w/ QPQ finish
  • 1/7 twist
  • .750 gas block journal
  • Rifle length gas system
  • M4 Feed Ramp Extension
  • HP and MPI tested
  • Standard A2 flash hider
Shipping to FFL Dealer Required No
Made In America Yes
Platform AR15
Complete Upper Series ATLAS
Caliber 5.56 NATO
Barrel Length 11.5
Weight (oz) 57 oz


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