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Questions & Answers
Is this 14.5 + a 1.5 muzzle device bringing the over all length to 16 inches? Expert Answer

The Aero Precision M4E1 Threaded 14.5in 5.56 Carbine Length w/ ATLAS S-ONE Handguard Complete Upper Receiver does not have a pinned and welded flash hider. So the barrel is 14.5", but if you have the flash hider pinned and welded it will meet the 16" rifle length requirement.

by Hunter, Gear Expert, October 4, 2022
I live in California do you pin and weld the flash hider because I would like to do that myself with a Comp. Expert Answer

We do not offer any pin and weld services.

by Ben, Gear Expert, February 9, 2021
Customer Reviews
Most Recent Reviews
But I wish the government didn't force me to get this thing pin and welded.
Read 1 Review

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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 Threaded 14.5in 5.56 Carbine Length w/ ATLAS S-ONE Handguard Complete Upper Receiver with Flash Hider

This complete upper includes our new ATLAS S-ONE Handguard! 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.image

WARNING: California`s Proposition 65

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

Manufacturer: Aero Precision
Caliber: 5.56x45mm NATO
Barrel Length: 14.5 in
Muzzle Device: A2 Flash Hider
Gun Model: AR-15
Handguard Length: 12 in
Gun Type: Rifle
Gun Make: AR Platform
Magazine Included: No
Country of Origin: USA

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

  • M4E1 Threaded Upper Receiver Features:
  • New enhanced forging that gives the upper receiver a inbillet lookin
  • 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
  • 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 oclock positions
  • Compatible with low profile gas blocks
  • 1.3 Inside diameter
  • 1.5 Outside diameter
  • Compatible with mil-spec AR15 upper receivers and barrels
  • Learn More about our NEW ATLAS S-ONE Hanguards
  • 14.5in 5.56 M4 CMV Barrel
  • Carbine Length Features:
  • Chamber: 5.56
  • Length: 14.5in
  • Twist: 1 in 7
  • Threading: 1/2inx28
  • Material: Chrome Moly Vanadium
  • Finish: QPQ corrosion resistant finish both inside and out
  • Gas Block: .750
  • Gas Port: .0785
  • Gas System Length: Carbine
  • Weight: 25.28 oz
  • M4 Barrel Extension
  • HP and MPI Tested
  • Included Accessories:
  • M4E1 Threaded Assembled Upper Receiver
  • ATLAS S-ONE Handguard of choice
  • 14.5in 5.56 M4 CMV Barrel
  • Carbine Length
  • 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
  • The muzzle brake that comes with this complete upper receiver is NOT pinned nor welded to this barrel
  • Per the National Firearms Act
  • the muzzle brake MUST be pinned and welded to achieve the necessary 16in as defined by the ATF for a rifle build.

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

List of Orderable Models

  • Aero Precision M4E1-T Complete Upper, 14.5in 5.56 Carbine Length BRL, 12in M-LOK AR15 ATLAS R-ONE HG, Anodized Black, APAR700704M32 , MPN: APAR700704M32 , UPC: 840014602292 , Code: 29D-UFH-M4E1T556145CL-APAR700704M32
  • Aero Precision Complete Upper Receiver, M4E1-T, 14.5in, 5.56 Carbine Length Barrel, 12in M-LOK ATLAS S-ONE Handguard, Flat Dark Earth, APAR700314M32 , MPN: APAR700314M32 , Code: 29D-UFH-M4E1T556145CL-APAR700314M32
  • Aero Precision Complete Upper Receiver, M4E1-T, 14.5in, 5.56 Carbine Length Barrel, 12in M-LOK ATLAS S-ONE Handguard, Anodized Black, APAR700304M32 , MPN: APAR700304M32 , UPC: 840014601264 , Code: 29D-UFH-M4E1T556145CL-APAR700304M32

Aero Precision M4E1 Threaded 14.5in 5.56 Carbine 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 Carbine Length Barrel, 12in KeyMod ATLAS S-ONE Handguard, Anodized Black, APAR700204P32 , MPN: APAR700204P32 , Code: 29D-UFH-M4E1T556145CL-APAR700204P32
  • Aero Precision Complete Upper Receiver, M4E1-T, 14.5in, 5.56 Carbine Length Barrel, 12in KeyMod ATLAS S-ONE Handguard, Flat Dark Earth, APAR700214P32 , MPN: APAR700214P32 , Code: 29D-UFH-M4E1T556145CL-APAR700214P32
  • Aero Precision M4E1-T Complete Upper, 14.5in 5.56 Carbine Length BRL, 12in M-LOK AR15 ATLAS R-ONE HG, FDE, APAR700714M32 , MPN: APAR700714M32 , UPC: 840014602308 , Code: 29D-UFH-M4E1T556145CL-APAR700714M32
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Last updated 2026-07-03 UTC.