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AR-15 Upper Assembly – 20″ / .223 | 5.56 / 1:8 / Straight Flute / 15″ Hera Arms Keymod AR-15 Handguard / Rail

(11 customer reviews)

This AR-15 upper assembly is made from the highest quality parts and the rails are engineered and manufactured in Germany with the remaining components being made within the United States. The 15" Hera Arms Keymod design features at the 12 o'clock position with Keymod slots at the 3, 6, and 9 o'clock positions to mount your favorite accessories. 7075-T6 Aluminum Mil-Spec Anodized Receiver Rifle Length Gas Tube Assembly 20" .223|5.56 WYLDE Straight Flute Barrel 4150 Chrome Mol - [READ MORE BELOW]

SKU: 160-650 Category: Tag:


ar15 20 223 5 56 straight flute 15 hera arms rail keymod

This AR-15 upper assembly is made from the highest quality parts and the rails are engineered and manufactured in Germany with the remaining components being made within the United States. The 15″ Hera Arms Keymod design features at the 12 o’clock position with Keymod slots at the 3, 6, and 9 o’clock positions to mount your favorite accessories.

  • 7075-T6 Aluminum
  • Mil-Spec Anodized Receiver
  • Rifle Length Gas Tube Assembly
  • 20″ .223|5.56 WYLDE Straight Flute Barrel
  • 4150 Chrome Moly Steel Phosphate Coated Barrel
  • Standard A2 Flash Hider
  • Twist Rate: 1:8
  • 15″ Hera Arms Keymod Handguard/Rail with Picatinny
  • *Does Not Include Bolt Carrier Group & Charging Handle*

Product Details: AR-15 Upper Assembly – 20″ / .223 | 5.56 / 1:8 / Straight Flute / 15″ Hera Arms Keymod AR-15 Handguard / Rail

➲ Upper Receiver

The foundation of all good AR's 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.

➲ Rifle Length Gas Tube

An essential component to your AR15 is the gas tube, which keeps your build up and running. This gas 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 nitride finish, this 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.

➲ Straight Flute Barrel

The barrel is one of the few components that directly affect the accuracy and weight of your build. Designed for corrosion resistance, this barrel will not let you down. Due to being machined from 4150 chrome moly steel, this barrel contains a better cut, higher-definition rifling, crowns, and chambers, resulting in the ability to stay more accurate over its usable life. This barrel utilizes the popular and versatile .223 Wylde chamber, which allows for the safe usage of 5.56 NATO ammunition and enhance reliability. This is the perfect barrel for an AR build, keeping weight to an absolute minimum due to the fluting, while still offering a significant ballistic advantage.

➲ A2 Flash Hider

The muzzle device is designed to perform a specific task, like suppress flash intensity or reduce felt recoil. This A2 Flash Hider is machined from quality steel and finished with an exceptionally corrosion resistant salt bath nitride for a lifetime of service. It provides effective flash suppression that preserves the shooter\\\\\\\\\\\\\\\'s night vision by disrupting the muzzle flash when firing in low lighting conditions. While its closed bottom with top and side ports offers reduced dust signature when shooting from the prone position while additionally acting as a compensator.

Additional information

Weight 5.65 lbs
Dimensions 36 × 4.5 × 4.5 in



Barrel Length

Twist Rate

11 reviews for AR-15 Upper Assembly – 20″ / .223 | 5.56 / 1:8 / Straight Flute / 15″ Hera Arms Keymod AR-15 Handguard / Rail

  1. Joseph Beckelhymer

    Broke in barrel properly turned out to be woodchucks worst nightmare, runs good very accurate rifle.
    Going to try it out this winter on sum coyotes. Customer service is vey good received first upper damaged in shipping sent it back got new one fast.
    Long picatiny rail really nice for mounting optics and rifle has very good cool facter as well with this upper key mod hand guard, accessories mount easily..
    would like to try 7.62×39 upper next think it would be good short range deer rifle.

  2. Cliff

    This was my first AR build. We spent a lot of time looking for parts, putting the lower together, and getting this upper into our newly put-together lower was fantastic. It was a drop-in. We both the charging handle and the bolt carrier group which were installed in the receiver. It shoots very well. As expected it has a barrel heavy balance. That was compensated by using a target sling.

    Overall this was a great upper and I will buy another from CBC.

  3. Derek Kanoy

    Received upper. There were issues.shipped it back.the return was quick.still had an issue.shipped it back again.the guys in the shop called me about it ,fixed it, sent the upper back.shoots great ! Good job.purchased some Hera them. I will soon purchase another upper. here is a shout out to customer service ever.thanks

  4. Ethan

    This was my first 223 build. spent some time looking for a quality/budget upper and this fit the bill perfectly. Everything is nice and tight and it shoots fantastic. Using some thrown together pet loads I was able to get groups down to about 1″ -1.5″, which makes me happy to know that it has some potential.

  5. James J. Grimes

    I put this upper on a lower I had assembled. The stock is an A2. This will be my tactical RIFLE and is set up with a MEPRO M21 Reflex Sight, BUIS, three-point sling, and a bipod that I will remove once the gun is fully sighted-in. A Streamlight weapon light will be mounted once I get a Keymod Picatinny rail section for it. I have been shooting it and there have been no malfunctions whatsoever. I have run 55gr. M193 and 75gr. Match loads through it so far. The match loads shot very well and the best 55gr. loads have been my reloads. I am still looking for a factory 55gr. load that will shoot M.O.A., but have not found it yet. Since this is a tactical rifle, I am keeping my shooting to 100 yards and closer, with most shooting at 50 yards.
    I am pleased with this upper do far.

  6. Gene Eby

    Well I ordered from CBC for my 4th build and as I ordered a very popular Upper had to wait for a few weeks to have my order fulfilled. Dealt with Chris, Julia, and Lorraine, actually change my order midway through the build and they never complained a bit. Received my upper and it matched perfectly to my Spikes Tactical lower , have yet to fire it, (need Optics) but the look and feel are terrific . Dealing with Chris, Julia , and Lorraine was like I was their best customer. Highly recommend this company for anyone looking to build a top of the line weapon. Will post further once I’ve been to the ranger, but truly expect it to perform as good as it looks.

  7. Gene Eby

    Got it mounted with optics and took it to the range and zeroed in three rounds then moved to 100 yds and this barrel was dead on, however, would not recharge, changed magazine and the same problem, changed lowers with one my others same thing. If I charge it manually no issues, is a tack driver, so called CBC and the tech wanted to talk me through resetting the gas tube in the gas block, I said no would rather they repaired it, so it’s on it’s way back to CBC on my dime this time, said 2 to 3 weeks and as I requested the test fire it that added another week, let’s hope my neighbor who ordered the same upper as I and waited 2 months also does not encounter any issues. Hoping mine is just an anomaly . Will post once I get it back.

  8. Gene Eby

    Finally an update from my previous review, got the upper back in 10 days, experienced some timing issues, contacted Vince , did some experimenting with buffers and springs and found the correct combination, rifle is perfect. Have used 4 different brands of ammunition in it, other than adjusting the optics for different loads this is an extremely accurate weapon. Cudos the Lorraine, Vince and the rest of the staff at CDC, they are always helpful, courteous, and genuine in their approach to you the customer. Look forward to my next purchase. Thanks again guys.

  9. Tony C

    Just received this upper today and it is a work of art, perfect in every way. I have yet to shoot it so can’t give a review on performance just yet but the attention to detail cbc put into assembly of this upper I expect no issues. I will definitely be buying again for other builds. Look forward to doing business again soon

  10. Cullen Gomes

    This upper right out of the box is like Christmas morning. attached to my psa lower (budget build) it looks great! the A4 rail top between the handguard and the receiver seem like there about 1/64 of an inch off on each side but isn’t a big deal really. I rate it 4 stars because the rear disassembly pin will not go all the way through. it goes through the first side of the lower, into the upper and it seems the hole isn’t exactly square to the drilling surface so it won’t go through to the other side completely. (side-note; i haven’t shot it yet). Other than that, nothing’s loose or off at all. very excited to shoot it.

    Short version: Looks and feels great. rated 4 because the rear disassembly pin doesn’t line up exactly and won’t go through.

  11. Brian

    I haven’t seen customer service like this in a long time. CBC stands behind their products and will fix any problems you might have. My BCG wasn’t moving freely into the chamber, I had to use the forward assist, seemed it had a few burrs on the feed ramps. I don’t know but I sent it back for a stainless barrel and problem solved, it works great now. They wasted no time sending it back to me, I had it back in a week. The stainless barrels and HERA rails are top notch. The gas block was perfectly centered and unlike the Radical Arms upper I had it fits my lower without a bunch of slop. I will be recommending CBC uppers to everyone I know. Will definately have to buy more uppers from CBC!

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