8.6 Blackout AR10/AR308 Premium Stainless Barrel



  • Barrel Length *

  • If you need a custom length let us know! When ordering choose the barrel that is closest to the size you are looking for. Give us the details and we will be in touch!

  • Barrel Profile *

    Check Barrel Profiles This link will take you to the barrel profile page.

  • The INFAMOUS 1:3 Twist.

Gas Block Journal

  • Gas Block Journal *

  • Steel Low Profile Gas Block

    Add Gas Block *

Gas System Length

  • Gas System Length *

  • Add Gas Tube *


  • Crown/Muzzle *

Sig/Q Taper

  • This is the "Official Q" Thread and Taper for the 8.6 Blackout Barrel.

Barrel Finish

Adding Nitride or Cerakote to your barrel will extend your lead time out 2-4 weeks depending on our vendor lead time.

  • Barrel Finish Options *

  • Cryogenics will add 2 weeks to your barrel lead time.

  • Make it Lighter and Stiffer! Carbon Fiber will lighten your barrel by approx 30%. This will increase your lead time 4-6 weeks.

Current Lead Times


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8.6 Blackout AR10/AR308 Premium Stainless Barrel$395.00
Barrel Length -
Custom Length - $25.00
Barrel Profile -
Twist Rate -
Gas Block Journal
Gas Block Journal -
Add Gas Block -
Gas System Length
Gas System Length -
Add Gas Tube -
Crown/Muzzle -
Sig/Q Taper
Q Taper 20° (M18x1.5) -
Barrel Finish
Barrel Finish Options -
Cryogenics - $120.00
Carbon Fiber - $300.00
Current Lead Times
Lead Times are Currently 16-18 Weeks -
Comments -

Product total

Options total

Grand total


8.6 Blackout AR10/AR308 Barrel Premium Stainless

MÔS-Tek’s version of the 8.6 Blackout Custom Premium Barrel Stainless

Match Grade
416R Stainless
5 R Rifling
1:3 Twist Rate

8.6 Blackout (8.6 BLK) is a centerfire rifle cartridge that uses a shortened casing from the 6.5 Creedmoor.  It is designed to be used in Bolt Action rifles or as an AR10 or AR308 rifle.  It uses the 1:3 Twist Rate and can be utilized as a supersonic or subsonic cartridge.

What’s the big deal with the 1:3 twist rate? This monumental 1:3 twist greatly enhances the energy of the large 8.6 blackout round.    

If you like .308 then what the 8.6 will give you is more energy.  It’s specifically designed for short barrels.  With an expanding 350 grain bullet, accurate to 300 yards, it hits hard.  If you want a lightweight gun that can be extremely quiet, shoot from long distance and bring down big (we’re talking BIG) animals then the 8.6 Blackout is most likely for you.

Like the 300 Blackout the 8.6 Blackout 1:3 Twist is designed primarily for suppressed shooting.  For the super-sonic shooter however there are loads being developed.

Having been dubbed as the 300 Blackouts “Bigger Brother” primarily due to the 300 Blackout catering to the AR15 market.  The 8.6 Blackout will be available in the AR10/.308 as well as a bolt gun platform.  Larger = Better right?

The skeptics that thought the 8.6 Blackout 1:3 Twist was never going to come to practical fruition are taking a seat and taking notes as it finds it’s place among the up and coming hunting cartridges.   The 8.6 Blackout 1:3 Twist has made it’s presence known and will be around now for the duration!

Welcome to the family 8.6 Blackout 1:3 Twist, pull up a chair!

Additional information

Weight4 lbs
Dimensions20 × 2 × 2 in


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