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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.

M4E1 THREADED 16" 5.56 MID-LENGTH COMPLETE UPPER RECEIVER W/ ATLAS S-ONE HANDGUA

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  • INCLUDES:

    • M4E1 Threaded Assembled Upper Receiver
    • ATLAS S-ONE M-LOK Handguard of choice
    • 16" 5.56 CMV Barrel
    • Low Profile Gas Block and Mid-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

    16" 5.56 MID-LENGTH BARREL FEATURES:

    • 5.56 NATO 16" Midlength, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled
    • .750 gas block journal
    • Mid-length gas system, .0785 gas port
    • M4 Feed Ramp Extension
    • HP and MPI tested
    • Standard A2 flash hider
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