MPN: SB30803-MP


  • Machined from Douglas Blank
  • M4 NiB coated barrel extension
  • Finish with Black Nitride in and out
  • Made in the U.S.A.

*A barrel that is shorter than 16" is only for use on a pistol configuration firearm or a NFA registered Short-Barreled Rifle (SBR). All NFA laws apply!


  • Caliber: .300 Blackout
  • Length: 8.3"
  • Gas Seat: 0.750"
  • Gas Placement: Pistol-Length
  • Twist Rate: 1:8
  • Weight: 1 lb 1.74 oz.
  • Material: Douglas Blank
  • M4 Feed Ramps: Yes
  • Muzzle Thread Pattern: 5/8"-24
  • Finish: Black Nitride


  • AR-15 upper receiver


Is it time to pick a new barrel for your old 300 Blackout friend because his has gotten tired? Or, is this AR-15 300 Blackout barrel for a brand new build? Either way, choosing the wrong barrel only ends up one way, in disappointment. How that barrel is made, what it's made from and by whom makes all the difference in the world. Let's talk about how a Spikes Tactical 300 Blackout barrel will make your world a better place.

What Is Inside?

Spikes Tactical settles for no less than to bring you the highest quality products at the lowest possible price. Because Spikes Tactical sets the bar this high, they make every part here in the USA from American sourced material. Spikes Tactical begins your new AR-15 300 Blackout barrel with a new Douglas barrel blank. Why would they do that? Well, because Douglas is reported to be the finest production barrel available. To make the best, you have to start with the best. That's why.

Send That Package Special Delivery

Inside and out, your new Spikes Tactical 300 Blackout barrel gets every custom touch you would order yourself. At the heart of the deal goes rifling at a 1-8 rate of twist. You need a 1-8 rate of twist to stabilize those beefy 300 Blackout rounds. Then, ST treats this little AR-15 300 Blackout barrel to a Black Nitride coating inside and out. And, don't forget that barrel extension. It gets M-4 feed ramps and is NIB coated. Everything together means you get a superior 300 Blackout barrel that will drive shots true while delivering excellent corrosion resistance. Why not scroll back up, click and get yours on the way today.

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