Aero Precision AR15 8″ .300 Blackout Barrel No Forward Assist Complete Upper w/ 7.3″ M-LOK R-ONE Handguard – OD Green Anodized

Aero Precision AR15 8″ .300 Blackout Barrel No Forward Assist Complete Upper w/ 7.3″ M-LOK R-ONE Handguard – OD Green Anodized

Build a better AR-15 without the hassle of assembling an upper from scratch. This AR15 complete upper from Aero Precision comes assembled with a 8″ .300 Blackout barrel and a 7.3″ ATLAS R-ONE M-LOK handguard, all finished in durable OD Green Anodized. It installs on any mil-spec AR-15 lower receiver in minutes.

.300 Blackout delivers .30-caliber energy from a short barrel and is a favorite for suppressed shooting, home defense and compact builds.

Key Features

• 7.3″ ATLAS R-ONE M-LOK handguard: a slim, free-floating M-LOK handguard with a full-length top rail for optics and lights.
• No forward assist: a clean, slick-side receiver that saves weight and snag points.
• Made in the USA by Aero Precision in Lakewood, Washington.

Specifications

• Brand: Aero Precision
• Platform: AR-15
• Series: AR15
• Caliber: .300 Blackout
• Barrel Length: 8″
• Handguard: 7.3″ ATLAS R-ONE M-LOK (free-float)
• Forward Assist: No
• Finish: OD Green Anodized
• Made in USA: Yes

Installation

Make sure the firearm is unloaded. Open the pivot and takedown pins on your AR-15 lower, seat the upper’s front lug in the pivot pin hole, close the receivers and push both pins home. Insert your charging handle and bolt carrier group, then perform a full function check before live fire. If you are unsure at any step, have a qualified gunsmith complete the installation.

Compatibility

Designed for mil-spec AR-15 lower receivers, including Aero Precision M4E1 and standard AR-15 lowers. It runs with a standard 5.56 bolt carrier group and standard AR-15 magazines (many shooters prefer .300 BLK-specific mags for heavy subsonic loads). Mark your .300 BLK magazines so they are never mixed with 5.56 ammunition.

Frequently Asked Questions

Does this complete upper include a bolt carrier group and charging handle?
No. Like most Aero Precision complete uppers, it ships without a bolt carrier group and charging handle, so you can choose the BCG and charging handle that suit your build.

Will it fit my lower receiver?
Yes, it is built to mil-spec dimensions and fits standard AR-15 lowers, including Aero Precision M4E1 lowers.

What bolt and magazines do I need?
It runs with a standard 5.56 bolt carrier group and standard AR-15 magazines (many shooters prefer .300 BLK-specific mags for heavy subsonic loads). Mark your .300 BLK magazines so they are never mixed with 5.56 ammunition.

What does “No Forward Assist” mean?
The receiver omits the forward assist plunger for a lighter, cleaner profile. Rifle function is otherwise unchanged.

Is a 8″ barrel legal on my build?
Barrels under 16″ are regulated under U.S. federal law. Depending on your configuration this upper may need to be used on an AR pistol, on a registered short-barreled rifle, or with a permanently attached muzzle device bringing overall barrel length to 16″. Check federal, state and local law before purchasing.

Does it ship to my state?
Some states and localities restrict certain firearm parts. It is the buyer’s responsibility to confirm the item is legal where they live before ordering.

Disclaimer

Aero Precision, M4E1, ATLAS, R-ONE and S-ONE are trademarks of Aero Precision. Other brand names are trademarks of their respective owners. Specifications and pricing come from the manufacturer and may change without notice. Product images are for illustration. The buyer is responsible for complying with all federal, state and local laws.