Join TexasGunTalk

8.5” barrel 300BLK adj gas block advise

Discussion in 'Rifles' started by pronstar, Aug 29, 2018.

  1. pronstar

    pronstar Well-Known TGT Supporter

    1,843
    1,976
    113
    Jul 2, 2017
    Dallas
    Recently purchased this from PSA...
    https://palmettostatearmory.com/psa...Avantlink&utm_medium=Referral&utm_campaign=cl

    ...am going to run subsonics and a suppressor so want to build it with an adjustable gas block.

    I’m sorta green to all of this.
    Can y’all recommend a gas block that’ll work?
    Do I need to measure anything?
    Says heavy barrel, is that a standardized measurement in choosing a gas block?


    Sent from my iPhone using Tapatalk Pro
     


  2. hoghunting

    hoghunting Active Member

    249
    39
    28
    Sep 24, 2014
    You'll need to measure the diameter of the barrel where the gas block will go. Since it's listed as heavy barrel, it could be .750" or .936".

    I don't use a suppressor so I can't help you with an adjustable block.
     
    pronstar likes this.
  3. CyberWolf

    CyberWolf New Member

    15
    12
    3
    Aug 22, 2018
    US


    Link shows a .750 diameter gas block seat, so that's the place to start. Clamp-adjistable is easier to install than set-screw/pinned if you don't have a drill/mill, just need to make sure you line the ports up properly (and account for front-plate offset on barrel)...

    Here's a good example of one that works well (you want the .750 size)...

    https://www.brownells.com/rifle-par...ble-gas-blocks-steel-clamp-on-prod109889.aspx

    Also, just to be clear, you may not need the adjustable block, and they are most definately a "wear" (fouling) part - e.g. don't be suprised if you have some form of failure event after a few thousand rounds of hard use and need to replace it, particularly if making ongoing adjustments instead of set-and-forget (Guvnah adjustable blocks used to be available which were almost indestructible, if heavy, but alas no more...)

    A suggestion might be to start with increasing buffer weight/reciprocal mass to slow down the action just a hair, and then see if you still need to replace the gas block..
     
    Last edited: Aug 29, 2018
    grasshopperglock and pronstar like this.
  4. pronstar

    pronstar Well-Known TGT Supporter

    1,843
    1,976
    113
    Jul 2, 2017
    Dallas
    I suppose I should see how it cycles with the can and desired ammo before I start mucking with it.

    But I haven’t even ordered the can yet, so that’s gonna be at least 8 months LOL


    Sent from my iPhone using Tapatalk Pro
     
    Last edited: Aug 29, 2018
  5. Charlie

    Charlie Semi-Literate TGT Supporter

    41,860
    1,376
    113
    Mar 19, 2008
    Kerr County
    Just adjust it to where it works with subsonic ammo now and when the can comes, try it and make any other adjustments needed.
     
  6. Charlie

    Charlie Semi-Literate TGT Supporter

    41,860
    1,376
    113
    Mar 19, 2008
    Kerr County
    That's what I'm doing with mine. Works good now with no can. I'll adjust it when the can is on it later if necessary.
     
  7. EZ-E

    EZ-E Infidel Patriot

    594
    455
    63
    May 4, 2017
    Cypress
    There are some bolt carriers on the market that have weights that can be removed, also differnt buffer & spring combos will be a cheap alternative to play with. It's really going to depend on the load your using also.
    Like you said you'll just have to experiment to see what she likes to run.
     
  8. tact

    tact Member

    139
    24
    18
    Jul 3, 2014
    Presidio
    An adjustable GB is not needed and that was the intent when it was created. I run supers, subs on a Saker can with no problems and no adjustable GB.
     
  9. pronstar

    pronstar Well-Known TGT Supporter

    1,843
    1,976
    113
    Jul 2, 2017
    Dallas
    But was it on a Palmetto Poverty Pistol?

    I hear ya tho...my suppressed AR has eaten everything I’ve thrown at it so far...


    Sent from my iPhone using Tapatalk Pro
     
    Last edited: Aug 29, 2018
    Charlie likes this.
  10. Charlie

    Charlie Semi-Literate TGT Supporter

    41,860
    1,376
    113
    Mar 19, 2008
    Kerr County
    There is not a big issue with any short barreled ARs. And should there be, the adjustable gas block fixes it.
     


Share This Page