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Aero Precision M4E1 10in .300 Barrel Complete Upper with Flash Hider Up to 10% Off w/ Free S&H — 4 models

Aero Precision M4E1 10in .300 Barrel Complete Upper with Flash Hider
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EQ-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221Q4
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EQ-9 HG, No BCG/Charging Handle, Gen 2, FDE Cerakote, 10in, APAR600222Q4
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, FDE Cerakote, 10in, APAR600222M4
Aero Precision M4E1 10in .300 Barrel Complete Upper with Flash Hider, Black, Flat Dark Earth
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EQ-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221Q4
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EQ-9 HG, No BCG/Charging Handle, Gen 2, FDE Cerakote, 10in, APAR600222Q4
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, FDE Cerakote, 10in, APAR600222M4
Aero Precision M4E1 10in .300 Barrel Complete Upper with Flash Hider
1 of 16 images
Aero Precision M4E1 10in .300 Barrel Complete Upper with Flash Hider
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EQ-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221Q4
2 of 16 images
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EQ-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221Q4
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EQ-9 HG, No BCG/Charging Handle, Gen 2, FDE Cerakote, 10in, APAR600222Q4
3 of 16 images
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EQ-9 HG, No BCG/Charging Handle, Gen 2, FDE Cerakote, 10in, APAR600222Q4
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
4 of 16 images
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, FDE Cerakote, 10in, APAR600222M4
5 of 16 images
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, FDE Cerakote, 10in, APAR600222M4
Aero Precision M4E1 10in .300 Barrel Complete Upper with Flash Hider, Black, Flat Dark Earth
6 of 16 images
Aero Precision M4E1 10in .300 Barrel Complete Upper with Flash Hider, Black, Flat Dark Earth
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EQ-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221Q4
7 of 16 images
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EQ-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221Q4
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EQ-9 HG, No BCG/Charging Handle, Gen 2, FDE Cerakote, 10in, APAR600222Q4
8 of 16 images
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EQ-9 HG, No BCG/Charging Handle, Gen 2, FDE Cerakote, 10in, APAR600222Q4
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
9 of 16 images
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
10 of 16 images
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
11 of 16 images
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
12 of 16 images
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
13 of 16 images
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
14 of 16 images
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
15 of 16 images
Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, FDE Cerakote, 10in, APAR600222M4
16 of 16 images
Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, FDE Cerakote, 10in, APAR600222M4

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Questions & Answers
Is the gas block adjustable? Expert Answer

The Aero Precision M4E1 10in .300 Barrel Complete Upper with Flash Hider does not feature an adjustable gas block. It uses a low-profile gas block and pistol length gas tube.

by Ethan, Gear Expert, March 28, 2024
Is the gen 2 hand guard the picatinny model like the picture? Expert Answer

Yes, this comes with the Enhanced Gen 2 handguard.

by Nick B., Gear Expert, November 12, 2021
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
Excellent quality Upper , very accurate. by Nico, Verified Owner, September 21, 2024
The fit and finish are perfect, everything is lined up and tight. slightly heavy but well built. excellent quality. Got it on sale and took a chance on it. worked out beter than expected matched it with a PSA pistol lower and a Larue MBT 2 stage, a...
Read More...
2/2 found this helpful
Helpful Negative Review
Waited two MONTHS for it to be missing screws by John, May 13, 2023
Overall Aero makes a pretty good product My beef isn't so much with the product as much as it is with the wait time and the quality control first off I ordered the 8-in upper the ship date was pushed back to the point where I had waited 2 months. Ke...
Read More...
13/18 found this helpful
Most Recent Reviews
Aero Upper by George Gladback, Verified Owner, September 2, 2025
Very well made,functions perfectly!Shipping was fast.
Most Recent Reviews
Aero Precision M4E1 10in .300 Barrel Complete Upper by RJOHN, Verified Owner, July 19, 2025
I bought this upper to complete a build. The Fde color is spot on. I've read other reviews on how the rails on this upper are not flush. That is not the case with my upper I highly recommend this upper .
Most Recent Reviews
Amazing!!! by Leo, Verified Owner, January 11, 2025
Fits Perfectly on my PSA lower. Shoots perfectly out of the box. Cons, Other than not have as much Mlok railing it get the job done.
Most Recent Reviews
300 Blackout Upper by Tu Padre 13, Verified Owner, September 24, 2024
Purchased to upgrade my 300 upper from PSA. Very happy with the build quality and arrived very quickly. Now just need to get some time to go test her out.
Read All 9 Reviews
4 Models Available
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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.

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 10in .300 Barrel Complete Upper with Flash Hider

This Complete Upper includes our Gen 2 Enhanced Handguard! Key features include the addition of quick disconnect sling sockets, enhanced milling design for grip and visual appeal and a new profile for the picatinny top rail.image

This assembly 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 16" as defined by the ATF for a rifle build.

Specifications for Aero Precision M4E1 10in .300 Barrel Complete Upper with Flash Hider:

Manufacturer: Aero Precision
Caliber: .300 AAC Blackout
Barrel Length: 10 in
Muzzle Device: A2 Flash Hider
Condition: New
Gun Type: Rifle
Gun Make: Aero Precision
Magazine Included: No
Country of Origin: USA

Features of Aero Precision M4E1 10in .300 Barrel Complete Upper with Flash Hider:

M4E1 UPPER FEATURES:

  • Forged from 7075 T6 aluminum

  • Precision machined to M4E1 specs
  • M4 feedramps
  • Matte black hard coat anodized Mil 8625 Type 3 Class 2
  • Laser engraved T-marks (Anodized only)
  • 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
    •  
    GEN 2 ENHANCED HANDGUARD FEATURES:
  • 1pc free float design
  • Built in anti-rotation tabs
  • Scalloped rails
  • Continuous top rail
  • 1.78" inside diameter fits most muzzle devices and 1.5" suppressors
  • Compatible with low profile gas blocks
  • Gen 2 Feature - Quick disconnect sling socket at the 3, 6 and 9 o'clock positions
  • Gen 2 Feature - Additional milling along flats to aid with gripping and add visual appeal
  • Gen 2 Feature - New profile for the continuous picatinny top rail
  • 10" .300 BLACKOUT BARREL FEATURES:
  • Length: 10"
  • Twist: 1 in 7
  • Muzzle: 5/8x24 Threaded
  • Material: 4150 Crome Moly Vanadium
  • Finish: QPQ corrosion resistant finish both inside and out
  • Gas Block: .750
  • Gas Port: .0935
  • Gas System Length: Pistol
  • Weight: 21oz
  • M4 Barrel Extension
  • HP and MPI Tested

    • Aero Precision M4E1 10in .300 Barrel Complete Upper with Flash Hider

    M4E1 Enhanced Assembled Upper Receiver

  • Enhanced Handguard of choice

  • 10" .300 Blackout CMV Barrel

  • Low Profile Gas Block and Pistol Length Gas Tube

  • Product comes assembled

  • This assembly 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 16" as defined by the ATF for a rifle build.

    • Aero Precision M4E1 10in .300 Barrel Complete Upper with Flash Hider Orderable Models

    List of Orderable Models

    • Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EQ-9 HG, No BCG/Charging Handle, Gen 2, FDE Cerakote, 10in, APAR600222Q4 , MPN: APAR640222Q4 , UPC: 815421022827 , Code: 29D-UFH-APM4ECUPB-1-APAR600222Q4
    • Aero Precision Complete Upper Receiver with Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4 , MPN: APAR640221M4 , UPC: 815421022674 , Code: 29D-UFH-APM4ECUPB-1-APAR600221M4
    • Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EQ-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221Q4 , MPN: APAR640221Q4 , UPC: 815421022735 , Code: 29D-UFH-APM4ECUPB-1-APAR600221Q4
    • Aero Precision Complete Upper Receiver w/Flash Hider, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, FDE Cerakote, 10in, APAR600222M4 , MPN: APAR640222M4 , UPC: 815421022766 , Code: 29D-UFH-APM4ECUPB-1-APAR600222M4

    Aero Precision M4E1 10in .300 Barrel Complete Upper with Flash Hider Unavailable & Discontinued Models

    List of Unorderable Models

    • DEMO, Aero Precision Complete Upper Receiver, M4E1, .300 Barrel EM-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221M4 , MPN: APAR640221M4-DEMO , Code: 29D-UFH-APM4ECUPB-1-APAR600221M4-DEMO
    • Aero Precision Complete Upper Receiver, M4E1, .300 Barrel EK-9 HG, No BCG/Charging Handle, Gen 2, Anodized Black, 10in, APAR600221P4 , MPN: APAR640221P4 , UPC: 815421022704 , Code: 29D-UFH-APM4ECUPB-1-APAR600221P4
    • Aero Precision Complete Upper Receiver, M4E1, .300 Barrel EK-9 HG, No BCG/Charging Handle, Gen 2, FDE Cerakote, 10in, APAR600222P4 , MPN: APAR640222P4 , UPC: 815421022797 , Code: 29D-UFH-APM4ECUPB-1-APAR600222P4
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