.300 Blackout 7.5″ M4 Barrel – Pistol Length

Rated 4.20 out of 5 based on 5 customer ratings
(5 customer reviews)


  • CALIBER: 300 Blackout
  • TWIST RATE: 1:7
  • MATERIAL: 4150 Chrome Moly Vanadium
  • FINISH: Parkerized
  • GAS SYS: Pistol
  • MUZZLE THREAD: 5/8-24
  • ADDITIONAL SPECS/NOTES: Not compatible with any other Caliber
UPC: N/A 640901515403 640901515106 SKU: N/A Categories: , Tags: , , , , , , , , ,

Additional information

Weight N/A
Dimensions N/A

Non-RF85, RF85 Treated

5 reviews for .300 Blackout 7.5″ M4 Barrel – Pistol Length

  1. Rated 5 out of 5


    does this barrel have m4 feed ramps?

    • Michael Johnson

      yes it does

  2. Rated 2 out of 5


    Will not cycle bolt properly with subsonic or supersonic . I’ve run reloads and off the shelf loads of various grains … I Have changed out buffer and Spring . I installed a Krinkov style brake , nothing so far has worked. I have a bolt action single shot 300 black pistol now . I will be attempting to open the gas port … if that fails it is going to be time to shop for a new barrel.

    • Michael Johnson

      maybe try our spiral gas tube or adjustable gas block.

  3. Rated 5 out of 5


    I just built a SBR with this barrel, it works great. I am very pleased. It cycles subs and supper sonics great and will print 1 inch groups at 50 yards using iron sights. I will pick up another 1 or two for projects.

  4. Rated 4 out of 5


    I have had this barrel for over a year now. I first had problems with it cycling some subs. I drilled out the gas port bigger and it cycles most subs now. One of my worries when I ordered this barrel was if the threads are concentric with the bore. It has worked great with my suppressor, no problems with alignment. I can’t say much about group size because I haven’t shot much paper with it yet. I would buy this barrel again. I just wish they made a lighter profile version.

  5. Rated 5 out of 5


    Is thus barrel chrome lined?

    • Michael Johnson

      No this barrel is not chrome lined

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