This complete upper receiver features the same tried-and-true construction and aesthetics as our M4E1 Enhanced Upper Receivers, without provisions for a forward assist. The M4E1 Enhanced Threaded Upper Receiver is a one-piece design combining the handguard mounting platform with the upper receiver itself. Through superior engineering, we have condensed the parts needed to mount a free-floated handguard to a mere 8 screws. Since the handguard mounting surface and upper are of the same forging, not only is it a stronger system, but we are able to make additional lightening cuts to save weight and allow for more efficient cooling.
Complete Upper Includes:
- M4E1 Enhanced Upper Receiver, No Forward Assist
- 15″ Gen 2 Enhanced Handguard
- 16″ 5.56 CMV Barrel
- Low Profile Gas Block and Mid-Length Gas Tube
- Port Door Assembly
- A2 Flash Hider
- This complete upper does not include BCG or Charging Handle.
M4E1 Threaded No Forward Assist Upper Receiver Features:
- No Forward Assist
- Custom enhanced forging that gives the upper receiver a “billet look” while maintaining the structural integrity of a forged part.
- Picatinny profile that blends seamlessly with our Enhanced and ATLAS Series Handguards
- M4 Feedramps
- .250 takedown pin holes
- Laser engraved T-marks
Atlas R-One 15″ Handguard:
- Full top Picatinny rail for optional attachments
- 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
- NOT Compatible with M4E1 Enhanced Upper Receivers
- ATLAS Handguards are designed to match seamlessly with Aero’s M4E1 Threaded Upper Receivers
16″ 5.56 Barrel Features:
- 5.56 NATO 16″ Barrel, 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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