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Rainier Arms Select 300BLK Barrel - 6.5" Satin (Non-Fluted)


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Satisfaction Guarantee

We are so confident in our barrels that we offer a 100% money back guarantee within 90 days of purchase.  If our barrels don’t meet or exceed your expectations, for any reason, return it for a full refund.


Many have asked us to build a barrel with the same workmanship as our Match barrels while keeping it more affordable. We are able to reach our goal by sourcing a very high end barrel blank at an affordable price. We start off using a high precision match blank in 1:7 twist, use a 5 groove polygonal rifling, machine it to the highest quality and matched with our limited-life time warranty, you have a barrel that is the best value, hands down, in the industry.


  • Stainless Steel Select Grade Blank
  • Length: 6.5"
  • Polygonal 1:7 rifling
  • Thread Pitch: 5/8 x 24
  • .750 Gas Block Seat
  • 300 AAC Blackout Chamber
  • Pistol -1 Gas System (Gas tube included)
  • M4 Feed Ramps
  • Proprietary Contour
  • Bead Blasted
  • Weight 13.9 oz

Our Craftsmanship

Rainier barrels are meticulously designed and machined by precision gunsmiths.  Our barrels are turned same the way true artisans have made premium rifle barrels for over a century.  Each barrel have hand-cut chambers and crowns with the attention to detail that can only come from highly trained human intervention.  While most companies strive for faster production time to cut cost, we strive for perfection. There are no shortcuts with our barrels, period.

We will go toe to toe with anyone and win.

More Information
Product Type Barrel
Manufacturer Rainier Arms, LLC
Thread Pitch 5/8x24
Gas Length Pistol -1
Finish Satin
Barrel Length 6.5"
Caliber 300BLK