This AR15 upper receiver assembly comes ready to attach to any Mil-Spec lower receiver. It is built around a 10.5 inch, 4150 chrome moly barrel that is chambered in 300 Blackout and has a black nitride finish. The upper receiver is a forged M4 flat top upper, allowing you to easily attach rifle scopes and red dot sights to the picatinny rail.
This upper assembly comes with a muzzle brake that effectively suppresses recoil and protects the 5/8×24 barrel threads if you are planning on changing the muzzle break in the future.
- Barrel: 10.5″ Melonite Barrel Chrome Moly
- Twist Rate: 1/8
- Feed Ramps: M4
- Gas Block: Steel .750 Low Profile
- Gas Tube: DGI Stainless Pistol-Length
- Muzzle Device: Muzzle Brake
- Rail: 10″ Keymod
- Upper Receiver: Forged Upper Receiver
- Upper Components: Mil-Spec Forward Assist, Mil-Spec Dust Cover, and Brass Deflector
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.
Product Details: AR-15 Upper Assembly – 10.5″ / 300 AAC / 1:8 / Muzzle Brake / 10″ CBC Arms Keymod AR-15 Handguard /Rail
➲ Muzzle Brake
A muzzle brake effectively cuts recoil and muzzle rise which permits you to make rapid-fire hits without having to fight to control your AR. This muzzle brake does an excellent job of keeping your rifle accurate and on target.
➲ CBC Keymod Handguard
New for 2020, these AR-15 handguards are built to provide rugged, reliable performance. Designed with the advanced shooter in mind, these handguards are both sleek and ergonomic in the hand and that translates into faster on-target performance and ease of use. These AR handguards provide Keymod slots for mounting attachments and feature robust steel mounting hardware to ensure an easy rock-solid installation.
➲ Upper Receiver
The foundation of all good ARs is built upon a dependable upper receiver. CBC upper receivers offer best-in-class quality while providing you years of dependable service. Boasting a MIL-SPEC type III hard coat anodized finish and machined from 7075-T6 forged aluminum, this M4 flat-top receiver delivers a lifetime of superior function. You want your AR built upon a solid platform - this receiver gives you the confidence that your AR-15 will function when it counts most.
➲ Pistol Length Gas Tube
An essential component to your AR15 is the gas tube, which keeps your build up and running. This gas pistol-length tube is constructed from corrosion resistant stainless steel ensuring a lifetime of service.
➲ .750 Low Profile Gas Block
The gas block is a critical link in the chain that is too often overlooked. This component ensures that your AR runs reliably. Made from high-quality steel with a smooth phosphate finish, this .750 low-profile gas block is efficiently designed to stay put with the percussion of gunfire. With its low profile this gas block allows it to fit under the most ergonomically designed handguards and rails on the market.
➲ 300 Blackout Barrel
The barrel is one of the few components that directly affect the accuracy and weight of your build. This barrel has a parkerized finish for increased strength and durability. This provides not only an impressive barrel life but ensures excellent accuracy. This barrel is optimized for stability with a 1:8 twist rate, making it the perfect match for the 300 Blackout caliber.
CBC provides a wide selections of AR-15 upper assemblies in a variety of styles and lengths - all partial AR-15 uppers are assembled with everything less the charging handle and bolt carrier group. Our partial upper assemblies offer quality and performance that will satisfy the most demanding shooter. Better yet, all CBC AR-15 uppers are custom built-to-order enabling us to provide you with the best prices you will find anywhere. The quality of our AR-15 uppers are backed by our Lifetime Warranty - if any CBC upper assembly becomes defective, we will repair or replace it at no charge. Get your AR-15 upper assembly at CBC today!
Pete C –
Ordered 6 days ago and was told it wouldn’t ship for 2 weeks. I was ok with that from the start, but it got here in just 5 business days! Slapped it on my lower I built last week. Ran 3 mags (1 subsonic 2 supersonic) through it with zero problems. Wish I’d have heard about this company years ago. This will most definitely not me the last time I order from them. Top notch product and a VERY fair price.
harold welch –
I purchased for a pistol build, and was not disappointed! My second upper from CBC. Great fit and finish, just over a week from order to delivery [awesome]. Headed out for some range time. Great job guy’s !
This is my 2nd upper from CBC. Even with the weather here in the Northeast the shipping was very quick, about a week. The fit and finish look awesome and I’m looking forward to putting it on my new SBR build. Great job CBC!