AR-15 Upper Assembly – 10.5″ / 300 AAC / 1:8 / 9″ Hera Arms IRS AR-15 Handguard / Rail

Rated 4.25 out of 5 based on 4 customer ratings
(4 customer reviews)

$269.00 $249.00

Out of stock

If you are a dealer, please log in to your account to see dealer pricing.


This AR-15 upper assembly is a complete Generation 2 upper assembly that features a 10 sided 10″ CBC Arms Gen 2 Keymod Rail. In addition, this assembly is made from the highest quality parts and is assembled in Charleston, South Carolina.

7075-T6 Aluminum
Mil-Spec Anodized Receiver
Pistol Length Gas Tube Assembly
10.5″ 300 AAC Barrel 
4150 Chrome Moly Steel Nitride Coated Barrel
CBC Compensator
Twist Rate: 1:8
13″ CBC Arms Gen 2 Keymod Handguard/Rail

*Does Not Include Bolt Carrier Group & Charging Handle*
Please Note: An “AR-15 Pistol” upper assembly has a barrel less than 16” in length. Pistol uppers are only for use on AR-15 pistol lowers and legal Short-Barreled Rifles. Other configurations may violate Federal law. Installation of AR-15 upper assemblies with certain features including, but not limited to: flash hiders, bayonet lugs, and threaded muzzles may violate state and/or local laws.

Additional information

Weight 2 lbs
Dimensions 16 x 11 x 2 in


Barrel Material

Barrel Coating

Barrel Length

Twist Rate


4 reviews for AR-15 Upper Assembly – 10.5″ / 300 AAC / 1:8 / 9″ Hera Arms IRS AR-15 Handguard / Rail

  1. Rated 4 out of 5


    I just got this receiver and haven’t assembled so I can’t review how it shoots yet. The barrel and Hera hand guard look really nice, but there are multiple blemishes on the finish of the receiver itself. I plan on having it DuraCoated so its no big deal.

  2. Rated 3 out of 5


    I have not shot thia yet but will follow up with another review after i do.

    Pros: fast shipping and was packaged very well. Everything feels solid and fit well on the lower and the price is great. Customer service in helping my selection was very friendly and good. Overall finish is excellent havent found any issues on it yet but its unfired.

    Cons: only trace of oil i found was on the dust cover otherwise rifle looked and felt bone dry. It came with a compensator attached that i had ordered separate and the actual flash hider is mia. The rail is a couple mills lower than the upper.

  3. Rated 5 out of 5


    Just completed my build with this addition. For this build I went with a New Frontier Carbon Lower. Rock River parts kit and Rock River BCM BCG. This complete upper lined up perfect with my lower and feels amazing. I’m loving the IRS rail system and the addition quick sling points. My magpul bugs CoWitnessed with my Aim AimPoint is flawlessly lined up. Can’t wait for my next build and try out your CQR stock!

  4. Rated 5 out of 5

    Christy Curry

    Purchased one of these uppers and the quality is good. I dropped it right on a lower and it ran like a champ. I would totally buy from these guys again.

Only logged in customers who have purchased this product may leave a review.