MPN: 0010120003


  • Precision machines to match grade tolerances for maximum accuracy
  • Chambered in 300BLK
  • Non-glare bead blasted stainless steel then Armor Black coated for longevity and ease of maintenance
  • 5R Button Rifling
  • Gas block alignment dimple

*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"
  • Gas Placement: Pistol-Length
  • Gas Seat: 0.750"
  • Twist Rate: 1:7 5R Button Rifling
  • Weight: 1 lbs. 1.3 oz.
  • Material: 416 Stainless Steel
  • M4 Feed Ramps: Yes
  • Muzzle Thread Pattern: 5/8"-24
  • Finish: Non-glare bead blasted then Armor Black coated

What is 300 Blackout? What are the benefits of the 300 Blackout cartridge? For more information about the 300 Blackout cartridge, please look at "What to Know about 300 Blackout".


If you want your SBR to be the best that it can be, you should begin with a cartridge designed for that particular platform. That would be the .300 blackout, it's quiet, easy to handle, and gives you excellent barrier penetration.

Start Your SBR/Pistol Build Right with This 300 Blackout Stainless Barrel

The Seekins 300 blackout stainless barrel takes that great little round to the next level of performance. The 300 blackout round was created to perform at its peak with heavy bullets fired subsonic from a suppressed SBR weapon. Bingo, Seekins little 8-inch 300 blackout barrel fills that ticket. Cleverly incorporating a 1/7 twist that flings rounds over 69 grains best, put that 300 blackout stainless barrel at the head of the pack.

Additionally, Seekins machined M4 feed ramps into their 8-inch 300 blackout barrel. This feature gives you a wider range of choices in ammo without the FTF problems apparent without this upgrade. Now, if you want an up-close CQB thumper you need to suppress that little beast. Again, this idea was a component in the creation of the 300 blackout round. The Seekins 300 blackout pistol barrel comes to you with standard 5/8 x 24 threads just waiting for your suppressor. The non-glare bead blast finish won’t reflect harsh light into your eyes and looks great besides.

Match-Grade 8-Inch .300 Blackout Barrel By Seekins Precision

This Seekins 8" 300 blackout barrel is designed to meet the rigorous requirements for match-grade and tactical rifles and carbines. Because each barrel produced by Seekins undergoes four separate tests, you can feel confident that it is able to withstand the stress of tactical situations and the heat of competition. Only premium stainless steel blanks are used in production to ensure quality that won’t let you down. Never settle for anything less than the best when dealing with your prized AR-15. Cheap or faulty barrels can lead to serious malfunction and even loss of life should you ever find yourself relying on the accuracy of your rifle to protect you.

Now, you need to tune that SBR to run with the big dogs. For that just put an adjustable low-profile adjustable gas block on your 300 blackout pistol barrel. All that's left is some fun range time to dial it in and you have a CQB beast on your hands.

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