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Questions & Answers
Does this come with gas block and gas tube? Expert Answer

Yes, the Aero Precision M5 20in .308 SS Complete Upper Receiver features a pre-installed gas block and gas tube. It will not include a BCG or charging handle.

by Ethan, Gear Expert, March 27, 2024
Will the Aero Precision M5 20in .308 SS Complete Upper Receiver w/ATLAS R-ONE Handguard - fit as a replacement upper for my dpms lr-308 gen II rifle? Expert Answer

The Aero Precision M5 20in .308 SS Complete Upper Receiver w/ ATLAS R-ONE Handguard is compatible with DMPS style AR10 components. So it should work just fine on a DPMS LR-308 lower receiver.

by Hunter, Gear Expert, March 16, 2022
Customer Reviews
Helpful Positive Review
M5 20” 308 upper by Jose, April 12, 2023
Excellent accuracy from the box , looks as good as it shoots, slapped a muzzle brake, took it to 200 yards first day out no issues hitting a 2 inch gong, looking forward to going further out, always satisfied with aero products.
1/1 found this helpful
Most Recent Reviews
Misleading “Complete Upper Receiver” - Missing BCG by Rob H, Verified Owner, September 10, 2025
I recently purchased a complete upper receiver and while the quality of the upper itself was solid, I was disappointed to find that it did not include a bolt carrier group (BCG). In my experience - and based on purchases from several other reputable...
Read More...
Most Recent Reviews
m5 308 stainless steel upper by willie, Verified Owner, January 6, 2023
Nice feel and amazing look. Upper matched great with my lower, everything seems to be good quality. Packing was great, received with no blemishes and in a timely manner. Has good accuracy and makes a good rifle
Read All 3 Reviews

Black Friday Starts NOW! Deals on Aero Precision, Stag, Ballistic Advantage and VG6 Precision

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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!
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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.

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 M5 20in .308 SS Complete Upper Receiver with Flash Hider w/ ATLAS R-ONE Handguard

Size and weight are important factors to consider when creating your compact build, so don't skimp on one of these Aero Precision M5 20in .308 SS Complete Upper Receivers w/ ATLAS R-ONE Handguard. These AR15 Upper Receivers by Aero Precision are crafted from 7075 T6 aluminum for a tough structure that won't weigh you down. Plus, these are properly heat treated so that they'll hold strong even after years of use. This Aero Precision M5 20in .308 Stainless Steel Complete Upper w/ ATLAS R-ONE Handguard includes a forward assist and a port door that ensures you get all the features you demand from this upper. With M-LOK cross slots, you can mount these receivers onto any AR-308 build, and the proprietary ATLAS attachment system will hold these accessories in place without weighing you down. You can even use this handguard to attach a vertical grip for added stability in the field since it has a 3in inside diameter. Put this Aero Precision M5 20in .308 SS Complete Upper Receiver w/ ATLAS R-ONE Handguard on your weapon to create a lightweight and rugged platform that can withstand heavy recoil.image

Specifications for Aero Precision M5 20in .308 SS Complete Upper Receiver with Flash Hider w/ ATLAS R-ONE Handguard:

Manufacturer: Aero Precision
Caliber: .308 Winchester
Overall Length: 30 in
Barrel Length: 20 in
Gas System Length: Rifle Length
Barrel Twist Rate: 1-10
Threads per Inch: 5/8x24
Handguard Type: Free-Float
Muzzle Device: A2 Flash Hider
Gun Model: M5
Condition: New
Fabric/Material: 416R Stainless Steel
Gas Block Journal Size-Diameter: .750 in
Handguard Length: 15 in
Gun Rail: Picatinny
Gun Make: Aero Precision
Included Accessories: None
Barrel Material: 416R Stainless Steel
Weight: 70 oz
Magazine Included: No
Mount Type: M-LOK
Projectile Caliber: .308 Caliber
Country of Origin: USA

Features of Aero Precision M5 20in .308 SS Complete Upper Receiver with Flash Hider w/ ATLAS R-ONE Handguard

  • M5 Assembled Upper Features:
  • Forged from 7075 T6 aluminum
  • M4 Feedramps
  • .2795 takedown pin holes
  • Laser engraved T-marks
  • DPMS High Profile (.210) Tang)
  • Includes port door and forward assist
  • ATLAS R-ONE Handguard Features:
  • Full top picatinny rail for optional attachments
  • Quick disconnect sling socket at the 3, 6 and 9 o'clock positions
  • Compatible with low profile gas blocks
  • 1.5in Inside diameter
  • 1.75in Outside diameter
  • Compatible with AR-308 Upper Recievers with a thread pitch of 1-7/16 x 16 along with a DPMS High Profile (.210) Tang Rail
  • Learn More about our NEW ATLAS Handguards
  • 20in .308 Stainless Steel Barrel Features:
  • Twist: 1 in 10
  • Threading: 5/8 x 24
  • Material: 416R Stainless Steel
  • Finish: Bead Blasted
  • Gas Block Journal: .750
  • Gas System Length: Rifle Length
  • Weight: 54.24 oz
  • DPMS Barrel Extension
  • HP and MPI Tested

Package Contents:

  • Aero Precision M5 20in .308 SS Complete Upper Receiver with Flash Hider w/ ATLAS R-ONE Handguard

Aero Precision M5 20in .308 SS Complete Upper Receiver with Flash Hider w/ ATLAS R-ONE Handguard Orderable Models

List of Orderable Models

  • Aero Precision M5 Complete Upper Receiver, 20in .308 SS Rifle Barrel, w/ATLAS R-ONE 15in M-LOK Handguard, Anodized, Black, APAR538705M34 , MPN: APAR538705M34 , Code: 29D-UFH-YM103K-APAR538705M34
  • Aero Precision M5 Complete Upper Receiver, 20in .308 SS Rifle Barrel, w/ATLAS R-ONE 15in M-LOK Handguard, Anodized, Flat Dark Earth, APAR538715M34 , MPN: APAR538715M34 , Code: 29D-UFH-YM103K-APAR538715M34

Aero Precision M5 20in .308 SS Complete Upper Receiver with Flash Hider w/ ATLAS R-ONE Handguard Unavailable & Discontinued Models

List of Unorderable Models

  • Aero Precision M5 Complete Upper Receiver, 20in .308 SS Rifle Barrel, w/ATLAS R-ONE 15in KeyMod Handguard, Anodized, Black, APAR538605P34 , MPN: APAR538605P34 , Code: 29D-UFH-YM103K-APAR538605P34
  • Aero Precision M5 Complete Upper Receiver, 20in .308 SS Rifle Barrel, w/ATLAS R-ONE 15in KeyMod Handguard, Anodized, Flat Dark Earth, APAR538615P34 , MPN: APAR538615P34 , Code: 29D-UFH-YM103K-APAR538615P34
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