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Aero Precision M5E1 18in .308 Winchester Complete Upper Receiver with Flash Hider Up to 14% Off and Blazin' Deal w/ Free S&H — 6 models

Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, CMV, Anodized, Black, APAR308233M25
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, Stainless Steel, Anodized, Black, APAR308554M26
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, CMV, Cerakote, FDE, APAR308253M25
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, Stainless Steel, Cerakote, FDE, APAR308556M26
Aero Precision Complete Upper Receiver M5E1, .308 Winchester, 18in Fluted SS Barrel, Rifle Length w/ Gen II EM-15 Handguard, Anodized, Black, APAR308554M69
Aero Precision Complete Upper Receiver M5E1, .308 Winchester, 18in Fluted SS Barrel, Rifle Length w/ Gen II EM-15 Handguard, FDE, APAR308556M69
Aero Precision Complete Upper Receiver M5E1, .308 Winchester, Black, FDE
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, CMV, Anodized, Black, APAR308233M25
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, Stainless Steel, Anodized, Black, APAR308554M26
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, CMV, Cerakote, FDE, APAR308253M25
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, Stainless Steel, Cerakote, FDE, APAR308556M26
Aero Precision Complete Upper Receiver M5E1, .308 Winchester, 18in Fluted SS Barrel, Rifle Length w/ Gen II EM-15 Handguard, Anodized, Black, APAR308554M69
Aero Precision Complete Upper Receiver M5E1, .308 Winchester, 18in Fluted SS Barrel, Rifle Length w/ Gen II EM-15 Handguard, FDE, APAR308556M69
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, CMV, Anodized, Black, APAR308233M25
1 of 13 images
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, CMV, Anodized, Black, APAR308233M25
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, Stainless Steel, Anodized, Black, APAR308554M26
2 of 13 images
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, Stainless Steel, Anodized, Black, APAR308554M26
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, CMV, Cerakote, FDE, APAR308253M25
3 of 13 images
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, CMV, Cerakote, FDE, APAR308253M25
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, Stainless Steel, Cerakote, FDE, APAR308556M26
4 of 13 images
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, Stainless Steel, Cerakote, FDE, APAR308556M26
Aero Precision Complete Upper Receiver M5E1, .308 Winchester, 18in Fluted SS Barrel, Rifle Length w/ Gen II EM-15 Handguard, Anodized, Black, APAR308554M69
5 of 13 images
Aero Precision Complete Upper Receiver M5E1, .308 Winchester, 18in Fluted SS Barrel, Rifle Length w/ Gen II EM-15 Handguard, Anodized, Black, APAR308554M69
Aero Precision Complete Upper Receiver M5E1, .308 Winchester, 18in Fluted SS Barrel, Rifle Length w/ Gen II EM-15 Handguard, FDE, APAR308556M69
6 of 13 images
Aero Precision Complete Upper Receiver M5E1, .308 Winchester, 18in Fluted SS Barrel, Rifle Length w/ Gen II EM-15 Handguard, FDE, APAR308556M69
Aero Precision Complete Upper Receiver M5E1, .308 Winchester, Black, FDE
7 of 13 images
Aero Precision Complete Upper Receiver M5E1, .308 Winchester, Black, FDE
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, CMV, Anodized, Black, APAR308233M25
8 of 13 images
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, CMV, Anodized, Black, APAR308233M25
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, Stainless Steel, Anodized, Black, APAR308554M26
9 of 13 images
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, Stainless Steel, Anodized, Black, APAR308554M26
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, CMV, Cerakote, FDE, APAR308253M25
10 of 13 images
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, CMV, Cerakote, FDE, APAR308253M25
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, Stainless Steel, Cerakote, FDE, APAR308556M26
11 of 13 images
Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, Stainless Steel, Cerakote, FDE, APAR308556M26
Aero Precision Complete Upper Receiver M5E1, .308 Winchester, 18in Fluted SS Barrel, Rifle Length w/ Gen II EM-15 Handguard, Anodized, Black, APAR308554M69
12 of 13 images
Aero Precision Complete Upper Receiver M5E1, .308 Winchester, 18in Fluted SS Barrel, Rifle Length w/ Gen II EM-15 Handguard, Anodized, Black, APAR308554M69
Aero Precision Complete Upper Receiver M5E1, .308 Winchester, 18in Fluted SS Barrel, Rifle Length w/ Gen II EM-15 Handguard, FDE, APAR308556M69
13 of 13 images
Aero Precision Complete Upper Receiver M5E1, .308 Winchester, 18in Fluted SS Barrel, Rifle Length w/ Gen II EM-15 Handguard, FDE, APAR308556M69

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Questions & Answers
Standard lower, or DPMS? Expert Answer

The Aero Precision M5E1 18in .308 Winchester Complete Upper Receiver with Flash Hider is only compatible with DPMS pattern lower receivers.

by Ethan, Gear Expert, March 27, 2024
can this item be shipped to california or arizona Manufacturer Answer

Unfortunately Optics Planet is unable to ship complete uppers to CA residents due to the firearm restrictions of the state of California. Please be advised that from Aero Precision, we have no restrictions on selling complete uppers to CA residents, however it is the customers responsibility to ensure that they configure and abide by their state and local laws. Optics Planet has no restrictions on selling complete uppers to AZ residents.

by Aero Precision USA, Manufacturer, April 27, 2022
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
Nice upper by hunter, Verified Owner, December 4, 2019
I bought this for a Aero M5 build and I love it. Shoots great and is pretty darn accurate. The brushed stainless fluted barrel with the 15 inch hand guard looks amazing too. I would definitely recommend this if someone is looking at a 18 inch AR 308 ...
Read More...
6/6 found this helpful
Helpful Positive Review
worth the money by T, Verified Owner, August 25, 2023
I highly recommend Aero precision uppers. Great craftsmanship, tight clearances, heavy barrel. Hand gaurd is large enough to add any furniture. Accuracy is superb! Add a nice BCG and charging handle and adjustable gas block and you will have a custom...
Read More...
2/2 found this helpful
Helpful Positive Review
Aero M5E1 18in .308 by ck, Verified Owner, February 25, 2024
Great quality and reliability, the cherokote is an excellent base for your area-based camo on the rifle. I cleaned the barrel and polished with compound then headed to the range. The First rounds were 1", and then polished again and groups were 1/2" ...
Read More...
2/2 found this helpful
Helpful Positive Review
Best AR 308 rifle you can build for the money by Byron, Verified Owner, June 16, 2024
The Aero Precision 308 upper is exactly what I wanted in an AR10 18” SS fluted barrel is amazing sub moa with GMM closer to sub .5 moa honestly with off the shelf ammo. I know some people like the M5 but I prefer the M5E1 due to its solid free float...
Read More...
2/2 found this helpful
Helpful Positive Review
She’s a beast by Kevin Wilson, Verified Owner, April 5, 2024
Picked mine up for under 600 bucks. I don’t think I would pay more than 650 that’s about what I would price this at but as long as you’re paying around that price rate you’re getting what you pay for it’s not the highest end and the finish on it isn’...
Read More...
2/2 found this helpful
Helpful Positive Review
great product from aero by jimbo, May 18, 2024
I bought this upper to complete my build, fit was pretty good for not having an aero lower.
1/1 found this helpful
Read All 16 Reviews

Star-Spangled Savings! Deals on Aero Precision Products to Celebrate

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Blazin' Deal
Prices have been cut drastically on this product as part of a special offer. These prices are so low that there's no double-dipping with coupons or any additional discounts, but you'll still get the best deal out there. This offer won't last long, so don't miss out!
6 Models Available
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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 M5E1 18in .308 Winchester Complete Upper Receiver with Flash Hider

Here is one of the best .308 rifle upper assemblies you can buy. The Aero Precision AR 308 Upper includes an M4 length gas block, 18" rifle length stainless steel barrel, and an Gen 2 enhanced handguard. The upper itself is a one-piece, free-float design crafted to be one of the strongest, lightweight, and long-lasting assemblies on the market. And the handguard platform is precision machined from 6061-T6 aluminum, and the top Picatinny rail is scalloped to help you mount even more accessories. The upper also features M4 feedramps and a port door, while the takedown pin holes are .2795. This upper receiver is an M5E1 version, which means it is compatible with both receiver extensions. The upper also has a .750 gas block journal, a rifle length gas system, and a forward assist and port door drilled into the barrel. That means you can use standard AR .308 components with this build. For a one-piece, free-floating upper receiver that is built to last and perform to the highest standards, install the Aero Precision AR M5E1 Upper Assembly.image

WARNING: California`s Proposition 65

Specifications for Aero Precision M5E1 18in .308 Winchester Complete Upper Receiver with Flash Hider:

Manufacturer: Aero Precision
Caliber: .308 Winchester
Barrel Length: 18 in
Gas System Length: Rifle Length
Barrel Twist Rate: 1-10
Muzzle Device: A2 Flash Hider
Gun Model: M5
Gun Rail: Picatinny
Gun Type: Rifle
Gun Make: Aero Precision
Magazine Included: No
Condition: New
Included Accessories: None
Country of Origin: USA

Features of Aero Precision M5E1 18in .308 Winchester Complete Upper Receiver with Flash Hider

  • M5E1 Upper Features:
  • Forged from 7075 T6 aluminum
  • Precision machined to our specs
  • M4 feedramps
  • Laser engraved T-marks (Anodized only)
  • .2795 takedown pin holes
  • Accepts standard AR .308 components
  • Comes with forward assist and port door installed
  • Handguard mounting platform is forged into the receiver
  • Gen 2 Enhanced Handguard Features:
  • Added quick disconnect sling socket at the 3, 6 and 9 o'clock positions
  • Milled additional surfaces along flats to aid with gripping and add visual appeal
  • New profile of the Picatinny Top Rail
  • 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
  • 18" .308 4150 CMV Barrel
  • Barrel, Rifle Length Features:
  • .308 Winchester 18" Barrel, 1/10 twist, 4150 CMV, gas port drilled
  • .750 gas block journal
  • Rifle length gas system
  • M4 Feed Ramp Extension
  • HP and MPI tested
  • Standard .308 A2 flash hider

Package Contents:

  • Aero Precision M5E1 18in .308 Winchester Complete Upper Receiver with Flash Hider
  • Includes:
  • M5E1 Enhanced Assembled Upper Receiver
  • 15&quot Enhanced M-LOK Handguard
  • 18&quot .308 4150 CMV Barrel Rifle Length
  • Low Profile Gas Block and Rifle Length Gas Tube
  • .308 A2 Birdcage Flash Hider

What firearm models does the manufacturer say Aero Precision M5E1 18in .308 Winchester Complete Upper Receiver with Flash Hider is compatible with?

The manufacturer suggests that Aero Precision M5E1 18in .308 Winchester Complete Upper Receiver with Flash Hider is compatible with M5

Aero Precision M5E1 18in .308 Winchester Complete Upper Receiver with Flash Hider Orderable Models

List of Orderable Models

  • Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, CMV, Anodized, Black, APAR308233M25 , MPN: APAR308233M25 , UPC: 840014618736 , Code: 29D-UFH-AEUPG2-APAR308233M25
  • Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, Stainless Steel, Anodized, Black, APAR308554M26 , MPN: APAR308554M26 , UPC: 840014608805 , Code: 29D-UFH-AEUPG2-APAR308554M26
  • Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, CMV, Cerakote, FDE, APAR308253M25 , MPN: APAR308253M25 , UPC: 840014618750 , Code: 29D-UFH-AEUPG2-APAR308253M25
  • Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, Stainless Steel, Cerakote, FDE, APAR308556M26 , MPN: APAR308556M26 , UPC: 840014608812 , Code: 29D-UFH-AEUPG2-APAR308556M26
  • Aero Precision Complete Upper Receiver M5E1, .308 Winchester, 18in Fluted SS Barrel, Rifle Length w/ Gen II EM-15 Handguard, Anodized, Black, APAR308554M69 , MPN: APAR308554M69 , UPC: 815421028621 , Code: 29D-UFH-AEUPG2-APAR308554M69
  • Aero Precision Complete Upper Receiver M5E1, .308 Winchester, 18in Fluted SS Barrel, Rifle Length w/ Gen II EM-15 Handguard, FDE, APAR308556M69 , MPN: APAR308556M69 , UPC: 815421028614 , Code: 29D-UFH-AEUPG2-APAR308556M69

Aero Precision M5E1 18in .308 Winchester Complete Upper Receiver with Flash Hider Unavailable & Discontinued Models

List of Unorderable Models

  • DEMO, Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, Cerakote, FDE, APAR308556M25 , MPN: APAR308556M25-DEMO , Code: 29D-UFH-AEUPG2-APAR308556M25-DEMO
  • Aero Precision Upper Receiver, M5E1, .308,18in, Rifle Barrel EK-15 HG, No BCG/Charging Handle, FDE Cerakote, APAR308556P25 , MPN: APAR308556P25 , UPC: 815421020656 , Code: 29D-UFH-AEUPG2-APAR308556P25
  • Aero Precision M5E1 18in .308 Upper Receiver, SS Rifle Barrel EK-12 HG, No BCG/Charging Handle, FDE Cerakote, APAR308536P26 , MPN: APAR308536P26 , UPC: 815421020687 , Code: 29D-UFH-AEUPG2-APAR308536P26
  • Aero Precision Upper Receiver, M5E1, .308, 18in, Rifle Barrel EK-15 HG, No BCG/Charging Handle, Anodized Black, APAR308554P25 , MPN: APAR308554P25 , UPC: 815421020649 , Code: 29D-UFH-AEUPG2-APAR308554P25
  • DEMO, Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, Stainless Steel, Cerakote, FDE, APAR308556M26 , MPN: APAR308556M26-DEMO , Code: 29D-UFH-AEUPG2-APAR308556M26-DEMO
  • Aero Precision Upper Receiver, M5E1, .308, 18in, SS Rifle Barrel EK-15 HG, No BCG/Charging Handle, FDE Cerakote, APAR308556P26 , MPN: APAR308556P26 , UPC: 815421020694 , Code: 29D-UFH-AEUPG2-APAR308556P26
  • Aero Precision Upper Receiver, M5E1, .308, 18in, SS Rifle Barrel EK-12 HG, No BCG/Charging Handle, Anodized Black, APAR308534P26 , MPN: APAR308534P26 , UPC: 815421020663 , Code: 29D-UFH-AEUPG2-APAR308534P26
  • Aero Precision M5E1 Complete Upper Reciever, .308, 18in Rifle Barrel, 1-10 Twist, 5/8x24 Thread, Free-Float Handguard, Cerakote, FDE, APAR308556M25 , MPN: APAR308556M25 , UPC: 840014608775 , Code: 29D-UFH-AEUPG2-APAR308556M25
  • Aero Precision Upper Receiver, M5E1, .308, 18in, SS Rifle Barrel EK-15 HG, No BCG/Charging Handle, Anodized Black, APAR308554P26 , MPN: APAR308554P26 , UPC: 815421020670 , Code: 29D-UFH-AEUPG2-APAR308554P26
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Last updated 2026-06-26 UTC.