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Aero Precision M4E1 16in 5.56 ATLAS R-ONE M-LOK Complete Upper Receiver with Flash Hider Up to 17% Off w/ Free S&H — 6 models

Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, Mid-Length Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700715M7
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, M4 Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M6
Aero Precision M4E1 15in ATLAS R-ONE M-LOK Complete Upper, 16in 5.56 HBAR CMV Mid-Length Barrel, Anodized Black, Black, APAR700705M97
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, Mid-Length Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M7
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, Mid Length Pencil Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M39
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, M4 Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700715M6
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, Mid-Length Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700715M7
Aero Precision M4E1 15in ATLAS R-ONE M-LOK Complete Upper, 16in 5.56 HBAR CMV Mid-Length Barrel, Anodized Black, Black, APAR700705M97
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, M4 Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700715M6
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, Mid-Length Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700715M7
1 of 9 images
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, Mid-Length Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700715M7
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, M4 Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M6
2 of 9 images
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, M4 Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M6
Aero Precision M4E1 15in ATLAS R-ONE M-LOK Complete Upper, 16in 5.56 HBAR CMV Mid-Length Barrel, Anodized Black, Black, APAR700705M97
3 of 9 images
Aero Precision M4E1 15in ATLAS R-ONE M-LOK Complete Upper, 16in 5.56 HBAR CMV Mid-Length Barrel, Anodized Black, Black, APAR700705M97
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, Mid-Length Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M7
4 of 9 images
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, Mid-Length Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M7
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, Mid Length Pencil Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M39
5 of 9 images
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, Mid Length Pencil Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M39
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, M4 Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700715M6
6 of 9 images
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, M4 Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700715M6
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, Mid-Length Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700715M7
7 of 9 images
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, Mid-Length Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700715M7
Aero Precision M4E1 15in ATLAS R-ONE M-LOK Complete Upper, 16in 5.56 HBAR CMV Mid-Length Barrel, Anodized Black, Black, APAR700705M97
8 of 9 images
Aero Precision M4E1 15in ATLAS R-ONE M-LOK Complete Upper, 16in 5.56 HBAR CMV Mid-Length Barrel, Anodized Black, Black, APAR700705M97
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, M4 Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700715M6
9 of 9 images
Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, M4 Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700715M6

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Questions & Answers
Can I mount this on my Colt AR 5.56 Lower?

Yes, it’s a mil spec upper

by Br. W., Verified Owner, July 18, 2025
It say COMPLETE upper, does that include BCG and charging handle?

No, item’s specifications list both as a no.

by Br. W., Verified Owner, July 18, 2025
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
AP ALL THE WAY!!!!!!!! by Diamond Dave, Verified Owner, April 2, 2024
Ive been loayl fan of AP for a very long time! I know its just another AR but copliments never stop with it and the price wont break the bank!
1/1 found this helpful
Helpful Positive Review
High quality by SGG, Verified Owner, April 16, 2024
Really happy with the purchase. Accuracy and built quality was very good. I would easily recommend Aero precision uppers.
1/1 found this helpful
Helpful Positive Review
Really can't beat it for the price by Solarum, August 21, 2023
I have to say, the finish is great. The Build is what you would expect Aero. I would am pleased overall. I really can't really complain. Great product overall. The muzzle break is really nothing special, but it will work.
2/2 found this helpful
Helpful Positive Review
Great upper by Mike, Verified Owner, April 16, 2023
This week I built my first AR. I decided to use all Aero components, and I was not disappointed, Works like a charm. There’s a lot to be said to use the same manufacture . For the money you can’t beat it. I would buy this again. The hand guard is aw...
Read More...
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Most Recent Reviews
AR Upper Receiver by CJ327, January 15, 2026
Item arrived quickly and in expected condition. Awaiting additional items to start build and am looking forward to this project completion.
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Great quality Upper by Tom, Verified Owner, September 1, 2025
This is my first Aero upper. Overall, the fitment, finish, and performance of this upper has been great.
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13% OFF AR Upper Receivers

See promotion details.
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Eligible models will have a savings offer and the coupon code to use below. Add the item to your cart and enter coupon code for savings on that select model! Limited time only. Cannot be combined with other promotions or offers.
6 Models Available
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ATTENTION! We currently do not ship this product to P.O. Boxes, AK, CA, CT, DE, HI, MA, NJ, NY, U.S. Territories, or select Colorado locations. Please see our policies for more information or a detailed list of locations.

made-in-usa-flag Made in USA

Help support American manufacturing! Marked models of this product have gone through rigorous review and been certified by the manufacturer as Made in the USA.

Product Info for Aero Precision M4E1 16in 5.56 ATLAS R-ONE M-LOK Complete Upper Receiver with Flash Hider

This complete upper receiver incudes an HBAR profile barrel that is laser marked "HBAR".image

WARNING: California`s Proposition 65

Specifications for Aero Precision M4E1 16in 5.56 ATLAS R-ONE M-LOK Complete Upper Receiver with Flash Hider:

Manufacturer: Aero Precision
Caliber: 5.56x45mm NATO
Overall Length: 26 in
Barrel Length: 16 in
Barrel Twist Rate: 1-7
Muzzle Device: A2 Flash Hider
Gun Model: AR-15
Gas Block Journal Size-Diameter: .750 in
Handguard Length: 15 in
Handguard Style: Quad Rail
Gun Make: AR Platform
Barrel Material: 4150 Chrome Moly Vanadium
Weight: 48.5 oz
Bolt Carrier Group Included: No
Charging Handle Included: No
Magazine Included: No
Condition: New
Country of Origin: USA

Features of Aero Precision M4E1 16in 5.56 ATLAS R-ONE M-LOK Complete Upper Receiver with Flash Hider

  • Laser engraved T-marks
  • Comes assembled, with port door and forward assist installed
  • Accepts standard AR15/M16 components
  • Handguard mounting platform is forged into the receiver
  • Works with Aero Precision handguards but also fits most BAR-system handguards
  • 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
  • Compatible with mil-spec AR15 upper receivers and barrels
  • MLOK attachment points

Package Contents:

  • Aero Precision M4E1 16in 5.56 ATLAS R-ONE M-LOK Complete Upper Receiver with Flash Hider
  • M4E1 Enhanced Assembled Upper Receiver
  • 15in ATLAS R-ONE M-LOK Handguard
  • 16in 5.56 HBAR barrel
  • Low Profile Gas Block and Mid-Length Gas Tube
  • Product comes assembled

What firearm models does the manufacturer say Aero Precision M4E1 16in 5.56 ATLAS R-ONE M-LOK Complete Upper Receiver with Flash Hider is compatible with?

The manufacturer suggests that Aero Precision M4E1 16in 5.56 ATLAS R-ONE M-LOK Complete Upper Receiver with Flash Hider is compatible with AR-15

Aero Precision M4E1 16in 5.56 ATLAS R-ONE M-LOK Complete Upper Receiver with Flash Hider Orderable Models

List of Orderable Models

  • Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, Mid Length Pencil Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M39 , MPN: APAR700705M39 , UPC: 840014602148 , Code: 29D-UFH-ME3-APAR700705M39
  • Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, M4 Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M6 , MPN: APAR700705M6 , UPC: 840014602070 , Code: 29D-UFH-ME3-APAR700705M6
  • Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, Mid-Length Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700715M7 , MPN: APAR700715M7 , UPC: 840014602049 , Code: 29D-UFH-ME3-APAR700715M7
  • Aero Precision M4E1 15in ATLAS R-ONE M-LOK Complete Upper, 16in 5.56 HBAR CMV Mid-Length Barrel, Anodized Black, Black, APAR700705M97 , MPN: APAR700705M97 , UPC: 840014616459 , Code: 29D-UFH-ME3-APAR700705M97
  • Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, Mid-Length Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M7 , MPN: APAR700705M7 , UPC: 840014602056 , Code: 29D-UFH-ME3-APAR700705M7
  • Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, M4 Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, FDE Cerakote, APAR700715M6 , MPN: APAR700715M6 , UPC: 840014602407 , Code: 29D-UFH-ME3-APAR700715M6

Aero Precision M4E1 16in 5.56 ATLAS R-ONE M-LOK Complete Upper Receiver with Flash Hider Unavailable & Discontinued Models

List of Unorderable Models

  • Aero Precision OPMOD AR-15 Compete Upper, Mid Length, 5.56x45, 1/2x28 Threads, Black , MPN: APSL100773-KIT2023 , Code: 29D-UFH-ME3-APSL100773-KIT2023
  • USED, Aero Precision M4E1 Threaded 5.56mm Complete Upper Receiver, 16in, M4 Barrel, 1-7 Twist, A2 Flash Hider, ATLAS R-ONE Handguard, Black Anodized, APAR700705M6 , MPN: APAR700705M6-EDEMO , Code: 29D-UFH-ME3-APAR700705M6-EDEMO-IN-D
  • DEMO, Aero Precision M4E1 15in ATLAS R-ONE M-LOK Complete Upper, 16in 5.56 HBAR CMV Mid-Length Barrel, Anodized Black, Black, APAR700705M97 , MPN: APAR700705M97-DEMO , Code: 29D-UFH-ME3-APAR700705M97-DEMO
  • Aero Precision M4E1 Threaded Complete Upper Receiver, 5.56, 16in, Mid-Length Barrel, 1-7 Twist, 15in ATLAS R-ONE Handguard, A2 Flash Hider, Cerakote, OD Green, APAR700402M7 , MPN: APAR700402M7 , UPC: 840014618699 , Code: 29D-UFH-ME3-APAR700402M7
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Last updated 2026-10-09 UTC.