Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Enjoy free shipping during the holidays! Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC and to all U.S. Military APO/FPO/DPO addresses.

Enjoy Our Extended FREE RETURNS

We want to ensure that making a return is as easy as possible! With our Hassle-Free, Extended Holiday Returns, eligible orders placed from November 12, 2025 on will benefit from an extended return deadline (January 13, 2026 or 30 days after receipt of your order - whichever is later). We'll even cover the cost of return shipping. Learn more about our Return Policy.

Shopping Cart
Government Export Restriction Government Export Restriction
Government Restriction Government Restriction
Customer Reviews
Most Recent Reviews
.300 Upper by Mike, Verified Owner, September 7, 2024
This mounted easily and securely to my Aero lower. I test fired it with a variety of ammo by manufacturer and weight, using a variety of 10 and 20 round .556 magazines (Lancer, Magpul, ProTech). It fired reliably and consistently. I did not really tr...
Read More...
Read 1 Review
4 Models Available
Finish
All
Color
All
Included Accessories
All
Search

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.

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-T 10in .300 AAC Blackout Complete Upper Receiver

This complete upper receiver features the same tried-and-true construction and aesthetics as our M4E1 Threaded Upper Receivers, without provisions for a forward assist.image

WARNING: California`s Proposition 65

Specifications for Aero Precision M4E1-T 10in .300 AAC Blackout Complete Upper Receiver:

Manufacturer: Aero Precision
Caliber: .300 AAC Blackout
Barrel Length: 10 in
Gas System Length: Pistol Length
Barrel Twist Rate: 1-7
Threads per Inch: 5/8x24
Muzzle Device: A2 Flash Hider
Gun Model: AR-15
Condition: New
Gas Block Journal Size-Diameter: .750 in
Handguard Length: 9 in
Barrel Material: 4150 Chrome Moly Vanadium
Bolt Carrier Group Included: No
Charging Handle Included: No
Magazine Included: No
Mount Type: M-LOK
Country of Origin: USA

Aero Precision M4E1-T 10in .300 AAC Blackout Complete Upper Receiver

M4E1 UPPER FEATURES:

  • Forged from 7075 T6 aluminum
  • Precision machined to M4E1 specs
  • M4 feedramps
  • Anodized Black Finish
  • 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
  • Barrel nut and wrench are included

S-ONE HANDGUARD FEATURES:

  • Interrupted picatinny rail for optional attachments
  • Full length MLOK attachment points at the 3, 6, and 9 o'clock positions
  • Compatible with low profile gas blocks
  • 1.3" Inside diameter
  • 1.5" Outside diameter
  • Compatible with mil-spec AR15 upper receivers and barrels

8" .300 PISTOL LENGTH BARREL FEATURES:

  • Chamber: .300 Blackout
  • Length: 10"
  • Twist: 1 in 7
  • Threading: 5/8x24
  • Finish: QPQ corrosion resistant finish both inside and out
  • Gas System Length: Pistol
  • M4 Barrel Extension
  • HP and MPI Tested

Package Contents:

  • Aero Precision M4E1-T 10in .300 AAC Blackout Complete Upper Receiver
  • 10" .300 Blackout Pistol Length Gov Barrel
  • Low Profile Gas Block and Pistol Length Gas Tube
  • 7.3" S-ONE Handguard
  • Product comes assembled

Aero Precision M4E1-T 10in .300 AAC Blackout Complete Upper Receiver Orderable Models

List of Orderable Models

  • Aero Precision M4E1-T Complete Upper Receiver, .300 AAC Blackout, 10in, Pistol Length, R-One M-LOK Handguard, Black, APAR712702M4 , MPN: APAR712702M4 , UPC: 840014616688 , Code: 29D-UFH-CSMP3-APAR712702M4
  • Aero Precision M4E1-T Complete Upper Receiver, .300 AAC Blackout, 10in, Pistol Length, S-One M-LOK Handguard, Black, APAR712102M4 , MPN: APAR712102M4 , UPC: 840014616701 , Code: 29D-UFH-CSMP3-APAR712102M4
  • Aero Precision M4E1-T Complete Upper Receiver, .300 AAC Blackout, 10in, Pistol Length, R-One M-LOK Handguard, FDE, APAR712712M4 , MPN: APAR712712M4 , UPC: 840014616695 , Code: 29D-UFH-CSMP3-APAR712712M4
  • Aero Precision M4E1-T Complete Upper Receiver, .300 AAC Blackout, 10in, Pistol Length, S-One M-LOK Handguard, FDE, APAR712112M4 , MPN: APAR712112M4 , UPC: 840014616718 , Code: 29D-UFH-CSMP3-APAR712112M4
Compare (0)