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Aero Precision M4E1-T 13.9in 5.56x45mm NATO RM12.7 Complete Upper Receiver Up to 14% Off, Blazin' Deal w/ Free Shipping — 2 models

Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Anodized, Black, Black, APAR700704M99
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Cerakote, FDE, FDE, APAR700714M99
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Anodized, Black, Black, APAR700704M99
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56x45mm NATO, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Anodized, Black, APAR700704M99
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Anodized, Black, Black, APAR700704M99
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Cerakote, FDE, FDE, APAR700714M99
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Cerakote, FDE, FDE, APAR700714M99
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56x45mm NATO, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Cerakote, FDE, APAR700714M99
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Anodized, Black, Black, APAR700704M99
1 of 8 images
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Anodized, Black, Black, APAR700704M99
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Cerakote, FDE, FDE, APAR700714M99
2 of 8 images
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Cerakote, FDE, FDE, APAR700714M99
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Anodized, Black, Black, APAR700704M99
3 of 8 images
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Anodized, Black, Black, APAR700704M99
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56x45mm NATO, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Anodized, Black, APAR700704M99
4 of 8 images
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56x45mm NATO, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Anodized, Black, APAR700704M99
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Anodized, Black, Black, APAR700704M99
5 of 8 images
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Anodized, Black, Black, APAR700704M99
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Cerakote, FDE, FDE, APAR700714M99
6 of 8 images
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Cerakote, FDE, FDE, APAR700714M99
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Cerakote, FDE, FDE, APAR700714M99
7 of 8 images
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56 x 45, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Cerakote, FDE, FDE, APAR700714M99
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56x45mm NATO, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Cerakote, FDE, APAR700714M99
8 of 8 images
Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56x45mm NATO, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Cerakote, FDE, APAR700714M99

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Questions & Answers
Customer Reviews
Helpful Positive Review
13.9, Not too long, Not too short by GhostChild308, Verified Owner, October 19, 2025
In my opinion, for a rifle build, next to 14.5, its the perfect length in 5.56. Respected brand, great quality, sturdy design, and affordable price!
1/1 found this helpful
Read 1 Review

Aero Precision Spring Specials - Save Now!

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ATTENTION! We currently do not ship this product to AK, CA, HI, IL, NY, WA, P.O. Boxes, and U.S. Territories. Please see our policies for more information.

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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-T 13.9in 5.56x45mm NATO RM12.7 Complete Upper Receiver

This complete upper includes our ATLAS R-ONE Handguard! The R-ONE handguards are designed with size and weight in mind, while still providing plenty of real-estate to accommodate any attachment needs the end user may have. 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-T 13.9in 5.56x45mm NATO RM12.7 Complete Upper Receiver:

Manufacturer: Aero Precision
Caliber: 5.56x45mm NATO
Barrel Length: 13.9 in
Barrel Profile: Government
Gas System Length: Mid Length
Barrel Twist Rate: 1-7
Firearms Threads Per Inch: 1/2x28
Handguard Type: A2
Muzzle Device: A2 Flash Hider
Gas Block Journal Size-Diameter: .750 in
Handguard Length: 12.7 in
Gun Type: Rifle
Barrel Material: 4150 CMV Steel
Bolt Carrier Group Included: No
Charging Handle Included: No
Magazine Included: No
Country of Origin: USA

Features of Aero Precision M4E1-T 13.9in 5.56x45mm NATO RM12.7 Complete Upper Receiver

  • M4E1 Threaded Upper Receiver:
  • 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
  • Atlas R-One Handguard: Full top picatinny rail
  • Quick disconnect sling socket at the 3, 6 and 9 o'clock positions
  • Compatible with low profile gas blocks
  • 1.3in Inside diameter
  • 1.5in Outside diameter
  • Compatible with mil-spec AR15 upper receivers and barrels
  • 13.9in 5.56 M4 CMV Barrel, Mid-Length:
  • 5.56 Nato 13.9in Barrel, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled
  • .750 gas block journal
  • Mid-Length Gas System
  • M4 Feed Ramp Extension
  • HP and MPI tested
  • Standard A2 flash hider

Package Contents:

  • Aero Precision M4E1-T 13.9in 5.56x45mm NATO RM12.7 Complete Upper Receiver
  • M4E1 Threaded Assembled Upper Receiver
  • 12.7in ATLAS R-ONE Handguard Of Choice
  • 13.9in 5.56 Mid-Length CMV Barrel
  • Low Profile Gas Block and Mid-Length Gas Tube
  • Product Comes Assembled

Aero Precision M4E1-T 13.9in 5.56x45mm NATO RM12.7 Complete Upper Receiver Orderable Models

List of Orderable Models

  • Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56x45mm NATO, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Anodized, Black, APAR700704M99 , MPN: APAR700704M99 , UPC: 840014620074 , Code: 29D-UFH-RMCUR127-APAR700704M99
  • Aero Precision Complete Upper Receiver, M4E1-T, RM12.7, 5.56x45mm NATO, 13.9in, Government, Mid Length, 1 in 7, 1/2 x 28, 12.7in, A2 Flash Hider, Cerakote, FDE, APAR700714M99 , MPN: APAR700714M99 , UPC: 840014620081 , Code: 29D-UFH-RMCUR127-APAR700714M99
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