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Questions & Answers
In the description, what is “threaded” referring to? Expert Answer

"threaded" in the description refers to the set screw. The set screw being threaded allows for easier installation and leaves less room for marring other parts upon installation.

by Brandon B, Gear Expert, July 21, 2021
Customer Reviews
Helpful Positive Review
It clearly states it does not have a BCG or CH. Do not rate it low because you can’t read. The upper itself is awesome and a great value for the price. Machining is on point. This is a better product than the sloppy work done at PSA.
13/15 found this helpful
Helpful Positive Review
Great product at a. Great price by Larry, November 13, 2020
When I opened the box I was amazed a t the quality and appearance of this upper. It is super light. Liked so much immediately started looking for another for another build. This has it all and for the price nothing out there compares
1/2 found this helpful
Helpful Positive Review
Awesome upper by John, Verified Owner, July 31, 2021
Great AR-15 upper! Looks good with an Aero M4E1 lower. Very good value for the money as well. It's lightweight and has a slim handguard. Received the package from Optics Planet in under a week. Highly recommended.
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Helpful Positive Review
Aero finest upper by chapo jr, Verified Owner, May 9, 2022
Bought this upper along with aero lower & bcg, heard many many positives reviews from Aero. This is my first AR shot 200+ rounds ZERO failures. HIGHLY RECOMMEND. Will purchase another aero product in the future.
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Helpful Positive Review
Great accuracy by PT, Verified Owner, November 7, 2022
Bought the 14.5" and mated it to a Geissele Super-Duty lower. Fit is great, no slop or gap. Shot about 3/4" MOA CTC with 75 gr HPBT. Gassing feels correct, cycled a standard full-auto bolt with a H buffer perfectly. Hand guard is as slim as it gets b...
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Helpful Positive Review
Excellent product. by Jim, September 16, 2019
I purchased this complete upper having had several Aero Precision products before. All have been excellent, and this has been no different. It is solid and lightweight, and the fde color matches my rifle perfectly. I would recommend it to anyone.
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Read All 26 Reviews
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Product Info for Aero Precision M4E1 Threaded 14.5in 5.56 Mid-Length w/ ATLAS S-ONE Handguard Complete Upper Receiver with Flash Hider

Finish your rifle build with this high-quality Aero Precision M4E1 Threaded 14.5in 5.56 Mid-Length w/ ATLAS S-ONE Handguard Complete Upper Receiver with Flash Hider. Aero Precision designed these AR15 Upper Receivers with QD sling sockets at the 3, 6 and 9 o'clock positions for simple sling attachment that creates a more comfortable carrying experience. This Aero Precision M4E1 Threaded 5.56 NATO w/ ATLAS S-ONE Handguard Complete Upper Receiver is outfitted with both a front and rear Picatinny rail for that attachment of scopes, lasers and other accessories. Also, the center of the top rail has been removed to reduce the weight. Greatly improve your weapon build by installing this Aero Precision M4E1 Threaded 14.5in 5.56 Mid-Length w/ ATLAS S-ONE Handguard Complete Upper Receiver with Flash Hider.image

Specifications for Aero Precision M4E1 Threaded 14.5in 5.56 Mid-Length w/ ATLAS S-ONE Handguard Complete Upper Receiver with Flash Hider:

Manufacturer: Aero Precision
Caliber: 5.56x45mm NATO
Barrel Length: 14.5 in
Barrel Profile: M4
Gas System Length: Mid Length
Barrel Twist Rate: 1-7
Muzzle Device: A2 Flash Hider
Gun Model: AR-15
Fabric/Material: 4150 CrMoV
Gas Block Journal Size-Diameter: .750 in
Handguard Length: 12 in
Handguard Style: Hybrid Rail
Gun Rail: M-LOK
Gun Make: AR Platform
Weight: 50 oz
Magazine Included: No
Condition: New
Country of Origin: USA

Features of Aero Precision M4E1 Threaded 14.5in 5.56 Mid-Length w/ ATLAS S-ONE Handguard Complete Upper Receiver with Flash Hider

  • 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
  • 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
  • Compatible with mil-spec AR15 upper receivers and barrels
  • 4150 CrMoV, QPQ, gas port drilled
  • .0785 gas port
  • M4 Feed Ramp Extension
  • HP and MPI tested
  • Standard A2 flash hider

Package Contents:

  • Aero Precision M4E1 Threaded 14.5in 5.56 Mid-Length w/ ATLAS S-ONE Handguard Complete Upper Receiver with Flash Hider
  • 5.56 CMV Barrel
  • Low Profile Gas Block
  • Mid-Length Gas Tube

Aero Precision M4E1 Threaded 14.5in 5.56 Mid-Length w/ ATLAS S-ONE Handguard Complete Upper Receiver with Flash Hider Orderable Models

List of Orderable Models

  • Aero Precision Complete Upper Receiver, M4E1-T, 14.5in, 5.56 Mid Barrel, 12in M-LOK ATLAS S-ONE Handguard, Anodized Black, APAR700304M5 , MPN: APAR700304M5 , UPC: 840014601301 , Code: 29D-UFH-M4E1T556145ML-APAR700304M5
  • Aero Precision Complete Upper Receiver, M4E1-T, 14.5in, 5.56 Mid Barrel, 12in M-LOK ATLAS S-ONE Handguard, Flat Dark Earth, APAR700314M5 , MPN: APAR700314M5 , UPC: 840014601318 , Code: 29D-UFH-M4E1T556145ML-APAR700314M5

Aero Precision M4E1 Threaded 14.5in 5.56 Mid-Length w/ ATLAS S-ONE Handguard Complete Upper Receiver with Flash Hider Unavailable & Discontinued Models

List of Unorderable Models

  • Aero Precision Complete Upper Receiver, M4E1-T, 14.5in, 5.56 Mid Barrel, 12in KeyMod ATLAS S-ONE Handguard, Anodized Black, APAR700204P5 , MPN: APAR700204P5 , Code: 29D-UFH-M4E1T556145ML-APAR700204P5
  • Aero Precision Complete Upper Receiver, M4E1-T, 14.5in, 5.56 Mid Barrel, 12in KeyMod ATLAS S-ONE Handguard, Flat Dark Earth, APAR700214P5 , MPN: APAR700214P5 , Code: 29D-UFH-M4E1T556145ML-APAR700214P5
  • DEMO, Aero Precision Complete Upper Receiver, M4E1-T, 14.5in, 5.56 Mid Barrel, 12in M-LOK ATLAS S-ONE Handguard, Flat Dark Earth, APAR700314M5 , MPN: APAR700314M5-DEMO , Code: 29D-UFH-M4E1T556145ML-APAR700314M5-DEMO
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