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.
Please Enable Your Browser's Cookies Functionality
Cookies are not currently enabled in your browser, and due to this the functionality of our site will be severely restricted.
Web browser based cookies allow us to customize our site for you, save items in your cart,
and provide you with a great experience when shopping OpticsPlanet.
Your privacy is important to us, and any personal information you supply to us is kept strictly confidential.
If you cannot enable cookies in your browser, please contact us — we are always here to help!
JavaScript is blocked by AdBlocker or ScriptBlocker
We're sorry - it looks like some elements of OpticsPlanet are being disabled by your AdBlocker.
Unfortunately we are unable to offer our excellent shopping experience without JavaScript.
Please add "opticsplanet.com" and "https://opl.0ps.us/assets-978b426d450/" to whitelist,
or disable AdBlocker for this site (please note that we do NOT feature any annoying ads on this website).
Thanks!
Your Browser is Outdated
Unfortunately, we are unable to provide an excellent shopping experience on your browser because it lacks modern functionality needed for us
to provide a fast, secure, and enjoyable experience. If you cannot upgrade your browser or use an alternative device to visit us,
please contact us at +1-800-504-5897 and we'll be happy to assist you over the phone!
Aero Precision M4E1 Threaded 20in 6.5 Grendel Complete Upper Receiver with Flash Hider w/ATLAS R-ONE Handguard Up to 19% Off Plus Blazin' Deal w/ Free Shipping — 2 models
Product came as expected. The hand guard is low profile and I’m a fan. You have to pick up a charging handle and a specific 6.5 Grendel bcg as well, separately, but that’s the norm.
This is an assembled upper. This is not a complete upper. A complete upper will include a bolt Carrier group and charging handle. This description is very misleading and inaccurate accurate and should be corrected immediately.
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!
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
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 Threaded 20in 6.5 Grendel Complete Upper Receiver with Flash Hider w/ATLAS R-ONE Handguard
Upgrade the performance of your AR15 build with this 6.5 Grendel Complete Upper Receiver. Designed to be a low recoil/high accuracy cartridge, the 6.5 Grendel is ideal for those looking to stretch the legs of their AR15 rifle, with proven results at 1000+ yards.
This complete upper includes their new ATLAS R-ONE Handguard! The R-ONE handguards are designed with size and weight in mind, while still providing plenty of real-estate to accommodate any attachment needs the end user may have. Their proprietary ATLAS attachment system is a durable and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards.
Specifications for Aero Precision M4E1 Threaded 20in 6.5 Grendel Complete Upper Receiver with Flash Hider w/ATLAS R-ONE Handguard:
Manufacturer:
Aero Precision
Caliber:
6.5mm Grendel
Overall Length:
30 in
Barrel Length:
20 in
Barrel Profile:
DMR
Gas System Length:
Rifle Length
Barrel Twist Rate:
1-8
Threads per Inch:
5/8x24
Handguard Type:
Free-Float
Muzzle Device:
A2 Flash Hider
Gun Model:
AR-15
Condition:
New
Fabric/Material:
416R Stainless Steel
Attachment Type:
Picatinny
Gas Block Journal Size-Diameter:
.750 in
Gun Rail:
Picatinny
Gun Make:
AR Platform
Included Accessories:
None
Bolt Carrier Group Included:
No
Charging Handle Included:
No
Weight:
70 oz
Magazine Included:
No
Mount Type:
Picatinny
Country of Origin:
USA
Features of Aero Precision M4E1 Threaded 20in 6.5 Grendel Complete Upper Receiver with Flash Hider w/ATLAS R-ONE Handguard
M4E1 Threaded Upper Receiver Features:
New enhanced forging that gives the upper receiver a "billet look"
New picatinny profile that blends seamlessly with our Enhanced Series Handguards
M4 Feedramps
.250 takedown pin holes
Laser engraved T-marks
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
Compatible with mil-spec AR15 upper receivers and barrels
Your Browser is Outdated
Made in USA
