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Questions & Answers
Will Aero Precision M4E1 AR-15 5.56 Rifle Barrel Complete Upper Receiver work with Bushmaster DCM high power rifle lower receiver? Expert Answer

The Aero Precision M4E1 AR-15 18in 5.56 Rifle Barrel Complete Upper Receiver with Flash Hider will work with a Mil-Spec AR15 lower, so it should work fine with that lower receiver.

by Hunter, Gear Expert, August 24, 2023
Hello there....Smithandwesson ar15 sport with a 16 inch barrel going to a 18 in barrel do 8 need a bolt carrying group ? Expert Answer

The Aero Precision M4E1 AR-15 5.56 Rifle Barrel Complete Upper Receiver does not include a bolt carrier group so you would need one in order for it to function. However, the bolt carrier from your M&P-15 upper receiver will fit in this Aero Precision upper and function as intended.

by Ethan, Gear Expert, February 2, 2023
Customer Reviews
Helpful Positive Review
Very satisfied by Beaze, January 20, 2020
This upper is very well put together. Very happy with the look and feel. Took it to the range and tested it out. Very accurate, smooth, and handles great. The SPR barrel helps with tight groups. Shooting 68gr match ammo and could stack rounds in the ...
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3/3 found this helpful
Helpful Positive Review
Assembled & good to go! by DANYO, Verified Owner, January 20, 2020
Definitely was nice being able to get this for my first build, I hear upper assembly is the most tedious part & thanks to this I won’t have to find out! It matched up perfectly with the m4 lower & has plenty of mounting space, went from the front al...
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3/4 found this helpful
Helpful Positive Review
Great upper, Aero never disappoints by BT, Verified Owner, April 17, 2018
First off be aware that Optics Planet has the wrong uppers pictured. They are showing the models w/o the A2 front sight but if you check the model #s that is what you will be receiving. In my case that’s what I wanted. The upper itself is top notch....
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8/10 found this helpful
Helpful Positive Review
The upper worked right out of the box. It has a carbine length gas system so it’s not over gases. The rail is a bit bigger around but not overly large. All in all I would say that this is a good deal the accuracy is decent.
4/5 found this helpful
Helpful Positive Review
Great upper! by the1320god, Verified Owner, June 19, 2018
I got this upper after some time waiting but was worth it. Replaced the flash hider before I put the upper on. Left everything else alone and I've got no complaints at all! Great product and a great price!
1/2 found this helpful
Helpful Positive Review
Quality Upper. by ThatGuy, January 29, 2019
I purchased the 10.5 M-Lok for a new build that I was doing and I am not disappointed that I bought it. At first I wished the rail was a little slimmer, but as time has gone on I’ve started to appreciate the larger diameter. It’s super solid and woul...
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1/1 found this helpful
Read All 22 Reviews

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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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Product Info for Aero Precision M4E1 AR-15 18in 5.56 Rifle Barrel Complete Upper Receiver with Flash Hider

The Aero Precision M4E1 Rifle Complete Upper Receiver comes with an M4E1 profile, which is compatible with both carbine and rifle configurations. These AR15 Upper Receivers from Aero Precision have an enhanced milling design for grip and visual appeal. In addition, the Aero Precision M4E1 Rifle Complete Upper Receiver comes with an Gen 2 Enhanced Handguard. On a lower receiver, the contour of the handguard is enhanced with milling, chamfers and a layered look. On an upper receiver, the contour of the barrel is enhanced with milling as well. While you're waiting, pick up an Aero Precision M4E1 Rifle Complete Upper Receiver w/ Enhanced Handguard today and outfit your rifle with one of the best handguards on the market.image

Specifications for Aero Precision M4E1 AR-15 18in 5.56 Rifle Barrel Complete Upper Receiver with Flash Hider:

Manufacturer: Aero Precision
Caliber: 5.56x45mm NATO
Barrel Length: 18 in
Barrel Profile: SPR
Gas System Length: Rifle Length
Barrel Twist Rate: 1-7
Threads per Inch: 1/2x28
Handguard Type: Free-Float
Muzzle Device: A2 Flash Hider
Gun Model: M16, AR-15
Fabric/Material: 7075-T6 Aluminum, 7075 T6 Aluminum
Attachment Type: Picatinny
Gas Block Journal Size-Diameter: .750 in
Handguard Length: 15 in
Gun Type: Rifle
Gun Make: Aero Precision, AR Platform
Included Accessories: Standard
Barrel Material: 4150 Chrome Moly Vanadium
Gas Block Journal Size-Length: .750 in
Bolt Carrier Group Included: No
Charging Handle Included: No
Weight: 68.5 oz
Magazine Included: No
Mount Type: Picatinny

Features of Aero Precision M4E1 AR-15 18in 5.56 Rifle Barrel Complete Upper Receiver with Flash Hider:

  • 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;

Features of Enhanced Handguard:

  • 1pc free float design;
  • Rail is Machined from 6061-T6 Aluminum;
  • 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;
  • Quick disconnect sling socket at the 3, 6 and 9 o'clock positions;
  • Additional milling along flats to aid with gripping and add visual appeal;
  • New profile for the continuous picatinny top rail

Features of 5.56 Rifle Length Barrel:

  • 4150 CrMoV w/ QPQ finish;
  • 1/7 twist;
  • .750 gas block journal;
  • Rifle length gas system;
  • M4 Feed Ramp Extension;
  • HP and MPI tested;
  • Standard A2 flash hider

Package Contents:

  • Aero Precision M4E1 AR-15 18in 5.56 Rifle Barrel Complete Upper Receiver with Flash Hider
  • Enhanced Handguard
  • 5.56 Rifle Length CMV Barrel
  • Low Profile Gas Block and Rifle Length Gas Tube
  • Barrel Nut
  • Wrench

Aero Precision M4E1 AR-15 18in 5.56 Rifle Barrel Complete Upper Receiver with Flash Hider Orderable Models

List of Orderable Models

  • Aero Precision M4E1 Complete Upper Receiver, AR-15, 18 in Rifle Length Barrel, 15 in M-LOK Handguard, No BCH/CH, Magpul Cerakote, Flat Dark Earth, APAR640252M8 , MPN: APAR640252M8 , UPC: 815421023497 , Code: 29D-UFH-M4E1CMRB-APAR640252M8
  • Aero Precision M4E1 Complete Upper Receiver, AR-15, 18 in Rifle Length Barrel, 15 in Quad Rail Handguard, No BCH/CH, Anodized, Black, APAR640251Q8 , MPN: APAR640251Q8 , UPC: 815421023442 , Code: 29D-UFH-M4E1CMRB-APAR640251Q8
  • DEMO, Aero Precision M4E1 Complete Upper Receiver, AR-15, 18 in Rifle Length Barrel, 15 in M-LOK Handguard, No BCH/CH, Anodized, Black, APAR640251M8 , MPN: APAR640251M8-DEMO , Code: 29D-UFH-M4E1CMRB-APAR640251M8-DEMO
  • Aero Precision M4E1 Complete Upper Receiver, AR-15, 18 in Rifle Length Barrel, 15 in M-LOK Handguard, No BCH/CH, Anodized, Black, APAR640251M8 , MPN: APAR640251M8 , UPC: 815421023312 , Code: 29D-UFH-M4E1CMRB-APAR640251M8

Aero Precision M4E1 AR-15 18in 5.56 Rifle Barrel Complete Upper Receiver with Flash Hider Unavailable & Discontinued Models

List of Unorderable Models

  • Aero Precision M4E1 Complete Upper Receiver, AR-15, 18 in Rifle Length Barrel, 15 in KeyMod Handguard, No BCH/CH, Anodized, Black, APAR640251P8 , MPN: APAR640251P8 , UPC: 815421023367 , Code: 29D-UFH-M4E1CMRB-APAR640251P8
  • Aero Precision M4E1 Complete Upper Receiver, AR-15, 18 in Rifle Length Barrel, 15 in Quad Rail Handguard, No BCH/CH, Magpul Cerakote, Flat Dark Earth, APAR640252Q8 , MPN: APAR640252Q8 , UPC: 815421023640 , Code: 29D-UFH-M4E1CMRB-APAR640252Q8
  • Aero Precision M4E1 Complete Upper Receiver, AR-15, 18 in Rifle Length Barrel, 15 in KeyMod Handguard, No BCH/CH, Magpul Cerakote, Flat Dark Earth, APAR640252P8 , MPN: APAR640252P8 , UPC: 815421023565 , Code: 29D-UFH-M4E1CMRB-APAR640252P8
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