Aero Precision M4E1-T Threaded 18" 5.56 AR 15 Complete Upper

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The AERO Precision M4E1-T 18" 5.56 AR 15 Complete Upper comes with the new ATLAS-S ONE M-LOK Handguard. AERO Precisions ATLAS-S ONE handguard is designed to be lightweight without sacrificing size or overall strength. With the slim profile AERO Precisions proprietary ATLAS attachment system is a durable and dependable mounting platform that customers have grown to love from AERO Precision AR 15 Handguards.


    • M4E1 Threaded Assembled Upper Receiver
    • ATLAS S-ONE Handguard of choice
    • 18" 5.56 Rifle Length CMV 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 under the FINISH YOUR BUILD tab

    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
    • Learn More about our NEW ATLAS S-ONE Hanguards

    18" 5.56 Rifle Length Barrel Features:

    • 5.56 Nato 18" 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
    Series ATLAS
    Caliber 5.56 NATO
    Barrel Length 18"

Extra Information