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Aero Precision M4E1 16in 5.56 ATLAS S-ONE M-LOK Complete Upper Receiver with Flash Hider Up to 18% Off w/ Free Shipping — 5 models

Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 12in M-LOK ATLAS S-ONE Handguard, Cerakote, Flat Dark Earth, APAR700314M6
Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 12in M-LOK ATLAS S-ONE Handguard, Anodized Black, APAR700304M6
Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 15in M-LOK ATLAS S-ONE Handguard, Cerakote, Flat Dark Earth, APAR700315M6
Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 15in M-LOK ATLAS S-ONE Handguard, Anodized Black, APAR700305M6
Aero Precision M4E1 15in ATLAS S-ONE M-LOK Complete Upper, 16in 5.56 HBAR CMV Mid-Length Barrel, Anodized Black, APAR700105M97
Aero Precision M4E1 15in ATLAS S-ONE M-LOK Complete Upper, 16in 5.56 HBAR CMV Mid-Length Barrel, Anodized Black, APAR700105M97
Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 12in M-LOK ATLAS S-ONE Handguard, Cerakote, Flat Dark Earth, APAR700314M6
1 of 6 images
Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 12in M-LOK ATLAS S-ONE Handguard, Cerakote, Flat Dark Earth, APAR700314M6
Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 12in M-LOK ATLAS S-ONE Handguard, Anodized Black, APAR700304M6
2 of 6 images
Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 12in M-LOK ATLAS S-ONE Handguard, Anodized Black, APAR700304M6
Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 15in M-LOK ATLAS S-ONE Handguard, Cerakote, Flat Dark Earth, APAR700315M6
3 of 6 images
Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 15in M-LOK ATLAS S-ONE Handguard, Cerakote, Flat Dark Earth, APAR700315M6
Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 15in M-LOK ATLAS S-ONE Handguard, Anodized Black, APAR700305M6
4 of 6 images
Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 15in M-LOK ATLAS S-ONE Handguard, Anodized Black, APAR700305M6
Aero Precision M4E1 15in ATLAS S-ONE M-LOK Complete Upper, 16in 5.56 HBAR CMV Mid-Length Barrel, Anodized Black, APAR700105M97
5 of 6 images
Aero Precision M4E1 15in ATLAS S-ONE M-LOK Complete Upper, 16in 5.56 HBAR CMV Mid-Length Barrel, Anodized Black, APAR700105M97
Aero Precision M4E1 15in ATLAS S-ONE M-LOK Complete Upper, 16in 5.56 HBAR CMV Mid-Length Barrel, Anodized Black, APAR700105M97
6 of 6 images
Aero Precision M4E1 15in ATLAS S-ONE M-LOK Complete Upper, 16in 5.56 HBAR CMV Mid-Length Barrel, Anodized Black, APAR700105M97

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Questions & Answers
So the product lists this upper as a mid-length gas system but in the package description it states it’s a carbine length gas system. Which is it? Expert Answer

The Aero Precision M4E1 15in ATLAS S-ONE M-LOK Complete Upper Receiver has a Mid-Length Gas System.

by Hunter, Gear Expert, February 9, 2023
See 1 More Answer
does the complete upper include a bolt and charging handle? Expert Answer

The Aero Precision M4E1 16in 5.56 ATLAS S-ONE M-LOK Complete Upper Receiver does not include a BCG or charging handle.

by Ethan, Gear Expert, December 5, 2024
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
Much better than expected! by Mac Shoots Film, Verified Owner, January 30, 2023
I begrudgingly bought this upper to make my AR Pistol "legal" (it was until they changed the rules overnight) and not have to worry about ATF showing up wanting to violate me. Packaging? - Once the package arrived the first thing I noticed was how...
Read More...
5/5 found this helpful
Helpful Positive Review
great upper by Jeremy, Verified Owner, May 24, 2021
This is a nice looking, sharp shooting upper. Never shoot an AR15 before putting this together. Everything functioned perfectly with no misfires. I ran about 120 rounds of 223 at the range. My only compliant would be that this is listed as a complete...
Read More...
19/21 found this helpful
Helpful Positive Review
M4E1 Treaded 16in 5.56 M4 Complete Upper Receiver w/ ATLAS S-ONE Handguard by TXARMAN, July 6, 2021
Purchased this Aero Precision upper chambered in 5.56 from a recommendation from a friend. He said all the products they make are of high quality and worth every dollar. As soon as my package arrived I was impressed by the packaging of the upper and ...
Read More...
2/2 found this helpful
Helpful Positive Review
Sweet piece by Mathias, November 18, 2022
Shoots strait and must say the comfort of the for grip is well worth it. The hand guard is my favorite part of this upper. Other then that it is a basic upper the same as many other brands to me. I also like the numbers on the rail.
1/1 found this helpful
Helpful Positive Review
Complete upper by Terry, Verified Owner, March 12, 2021
As described. Fits good to my lower. Seems to be well built. Very good looking upper. Just have to take to range and set some sights. Can’t wait to do some shooting. Would highly recommend if anyone looking for an inexpensive upper.
1/3 found this helpful
Most Recent Reviews
upper receiver by Miguel Narvaez, Verified Owner, August 10, 2025
Top notch item. The only thing is that on the description it said it had a longer hand guard but when it got here it was way off
Read All 17 Reviews
5 Models Available
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Product Info for Aero Precision M4E1 16in 5.56 ATLAS S-ONE M-LOK Complete Upper Receiver with Flash Hider

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

Specifications for Aero Precision M4E1 16in 5.56 ATLAS S-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
Condition: New
Fabric/Material: 4150 CrMoV
Gas Block Journal Size-Diameter: .750 in
Handguard Style: Quad Rail
Gun Rail: M-LOK
Gun Type: Rifle
Gun Make: AR Platform
Included Accessories: None
Barrel Material: 4150 Chrome Moly Vanadium
Bolt Carrier Group Included: No
Charging Handle Included: No
Weight: 48.5 oz
Magazine Included: No
Country of Origin: USA

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

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

The manufacturer says that Aero Precision M4E1 16in 5.56 ATLAS S-ONE M-LOK Complete Upper Receiver with Flash Hider is compatible with AR-15, M16

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

List of Orderable Models

  • Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 12in M-LOK ATLAS S-ONE Handguard, Anodized Black, APAR700304M6 , MPN: APAR700304M6 , UPC: 840014601387 , Code: 29D-UFH-ME2-APAR700304M6
  • Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 15in M-LOK ATLAS S-ONE Handguard, Anodized Black, APAR700305M6 , MPN: APAR700305M6 , UPC: 840014601424 , Code: 29D-UFH-ME2-APAR700305M6
  • Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 12in M-LOK ATLAS S-ONE Handguard, Cerakote, Flat Dark Earth, APAR700314M6 , MPN: APAR700314M6 , UPC: 840014601394 , Code: 29D-UFH-ME2-APAR700314M6
  • Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 15in M-LOK ATLAS S-ONE Handguard, Cerakote, Flat Dark Earth, APAR700315M6 , MPN: APAR700315M6 , UPC: 840014601431 , Code: 29D-UFH-ME2-APAR700315M6
  • Aero Precision M4E1 15in ATLAS S-ONE M-LOK Complete Upper, 16in 5.56 HBAR CMV Mid-Length Barrel, Anodized Black, APAR700105M97 , MPN: APAR700105M97 , UPC: 840014616442 , Code: 29D-UFH-ME2-APAR700105M97

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

List of Unorderable Models

  • Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 12in KeyMod ATLAS S-ONE Handguard, Anodized Black, APAR700204P6 , MPN: APAR700204P6 , Code: 29D-UFH-ME2-APAR700204P6
  • DEMO, Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 12in M-LOK ATLAS S-ONE Handguard, Anodized Black, APAR700304M6 , MPN: APAR700304M6-DEMO , Code: 29D-UFH-ME2-APAR700304M6-DEMO
  • Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 15in KeyMod ATLAS S-ONE Handguard, Anodized Black, APAR700205P6 , MPN: APAR700205P6 , Code: 29D-UFH-ME2-APAR700205P6
  • Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 12in KeyMod ATLAS S-ONE Handguard, Cerakote, Flat Dark Earth, APAR700214P6 , MPN: APAR700214P6 , Code: 29D-UFH-ME2-APAR700214P6
  • Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 15in KeyMod ATLAS S-ONE Handguard, Cerakote, Flat Dark Earth, APAR700215P6 , MPN: APAR700215P6 , Code: 29D-UFH-ME2-APAR700215P6
  • DEMO, Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 12in M-LOK ATLAS S-ONE Handguard, Cerakote, Flat Dark Earth, APAR700314M6 , MPN: APAR700314M6-DEMO , Code: 29D-UFH-ME2-APAR700314M6-DEMO
  • USED, Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 15in M-LOK ATLAS S-ONE Handguard, Anodized Black, APAR700305M6 , MPN: APAR700305M6-EDEMO , Code: 29D-UFH-ME2-APAR700305M6-EDEMO-RE-C
  • DEMO, Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in, M4 Barrel, 15in M-LOK ATLAS S-ONE Handguard, Anodized Black, APAR700305M6 , MPN: APAR700305M6-DEMO , Code: 29D-UFH-ME2-APAR700305M6-DEMO
  • Aero Precision Complete Upper Receiver M4E1-T, 5.56, 16in w/ Sig Sauer ROMEO5 1x20mm Red Dot Sight , MPN: APAR700304M6-KIT1 , Code: 29D-UFH-ME2-APAR700304M6-KIT1
  • Aero Precision Complete Upper Receiver, M4E1-T, 5.56, 16in w/ Sig Sauer ROMEO5 1x20mm Red Dot Sight , MPN: APAR700315M6-KIT1 , Code: 29D-UFH-ME2-APAR700315M6-KIT1
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