M4E1 Threaded 13.9" 5.56 Mid-Length No Forward Assist Complete Upper w/ 12.7" M-LOK S-ONE Handguard - Anodized Black

This complete upper receiver features the same tried-and-true construction and aesthetics as our M4E1 Threaded Upper Receivers, without provisions for a forward assist. 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 No Forward Assist Upper Receiver 12.7" ATLAS S-ONE M-LOK Handguard of choice 13.9" 5.56 Mid-Length 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 No Forward Assist 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 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