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300 Blackout 16″ Heavy AR 15 Rifle Barrel, 1:8 Twist, 4150 Chromoly Steel, Parkerized


300 Blackout 16" Heavy AR 15 Rifle Barrel, 1:8 Twist, 4150 Chromoly Steel, Parkerized

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SKU: B300CHB1618(P).875


For the 300 blackout rifle builder looking for the most affordable, highest quality, hardest, and most accurate 300 Blackout Rifle Barrel, you’ve found it. Our 16″ Heavy Barrel features precision turned rifling inside 4150 Chromoly Steel, guaranteeing 1 MOA of accuracy at 100 yards (if you’re good enough). Made in the USA, this barrel undergoes strict ISO 9002 quality control checks with 100% inspection on every barrel – not in batches like other ” economy” barrel makers.

Why Our 300 Blackout Barrel is Better

Any AR 15 rifle barrel can spit out lead and provide acceptable accuracy, as long as it wasn’t machined with a potato. But making a truly great barrel, an accurate one that, in this case, can provide that 1 MOA accuracy you need with both supersonic and subsonic 300 Blackout, requires a lot more. Our barrels use 4150 Chromoly Steel without chrome lining – and that’s a good thing. Rather than rely on the inaccuracy issues chrome lining causes, our barrels are heat treated to a hardness rating of RC 28 to RC 32. They’re then stress relieved for durability. This provides diamond-hard rifling that’ll last for tens of thousands of rounds – more than any other barrel.

A More Accurate 300 Blackout Rifle Barrel

Because our heavy rifle barrels feature hardened rifling and a Chromoly Steel construction without chrome lining, you get the best of both worlds: Superior durability and barrel life with unparalleled accuracy. With a 1:8 twist rate and the Goldilocks carbine gas and 16″ length combo, you’ll be reliably hitting one-inch groups with any 300 Blackout load (super or sub) if you trust this barrel. The price almost seems too good to be true. We promise, it isn’t.

300 Blackout Rifle Barrel Features:

  • 300 AAC Blackout Chamber
  • 16″ with Parkerized Finish
  • Heavy Profile
  • 1:8 Twist Rate
  • 4150 Chromoly Steel
  • Heat Treatment to RC 28-32
  • Stress Relieving Steel Treatment
  • CNC Cut Rifling
  • Carbine Gas System (Block 0.875, Hole 0.125)
  • M4 Feed Ramps
  • 5/8 x 24 Thread Pitch
  • Weight: 2.3 lbs.

No FFL required Made in the USA Lifetime Warranty

300 Blackout 16″ Heavy AR 15 Rifle Barrel, 1:8 Twist, 4150 Chromoly Steel, Parkerized


In stock

Save For Later
Save For Later

Free Shipping on all orders $325+!

Customer Reviews

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    Outstanding barrel!

    To be honest, my purchase of the heavy barrel was a mistake. I was comparing a number of different barrels and was intending to purchase an M4 profile barrel. But bouncing between screens, I ended up getting the 16" heavy barrel. Long story short, the people at 300-blackout upper offered to swap out the barrel but I decided to keep the HB. This was one of my best decisions. The barrel was shooting sub-2" groups at 100y from an impromptu rest with the first 10 rounds test firing the gun. Setting down on a proper rest and putting a decent scope on top, the gun was shooting sub-1" groups with the first handload tested. The more I shoot the HB, the more impressed I am. To be honest, the barrel is easily out shooting a high end SBR barrel that cost three times as much. The plain Jane 16" HB is bluntly one of the best barrels that I have used in thirty years of building AR platform rifles for customers and my own use. I will be buying another barrel from 300-blackout upper.


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