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I’m new to subpressed

Discussion in 'NFA & Class III Discussion' started by Pearl Cruz, Oct 1, 2018.

  1. Pearl Cruz

    Pearl Cruz Marksman

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    I recently got a 30 cal suppressor. I put it on a 300 BO AR. It cycles fine with full house loads but with the Whisper round (low powered for suppressors) it short cycles and jams the empty.
    Do I need a heavier buffer or an adjustable gas block?

    Any help would be appreciated.
     
  2. Mad Professor

    Mad Professor Sharpshooter

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    Are you using factory sub-sonics like Remington’s 220gr offering?

    The “Whisper” name actually refers to a wildcat cartridge designed by JD Jones. It will chamber on the 300 Blackout, but there is very few (if any now) commercial ammo bearing that name.

    What buffer will be dependent on your gun.
    All of mine will run factory Remington supers and subs both suppressed and unsuppressed without an adjustable gas block. But, I’ve seen many have issues. Even reloads with some powders can be a big problem.
     
  3. lasher

    lasher Sharpshooter

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    if the gun is short stroking then it is under gassed, a heavier buffer would not help that problem. i would contact the rifle builder and find out the dimensions of the gas port on the barrel. i have adjustable gas blocks on all my rifles but i enlarged the gas port a few, very few, thousandths of an inch prior to the build.
     
  4. Pearl Cruz

    Pearl Cruz Marksman

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    This was what I was thinking it probably was. But I was hoping I might be able to sneak by with a heavier buffer. I think I’ll try it, but plan on enlarging the hole.
    Thanks to both of you.
     
  5. lasher

    lasher Sharpshooter

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    don't over do the enlarging thing, i used a #43 wire size bit to do mine, find out the stock size so you can determine what bit size to use, put a dowel the diameter of the bore in the barrel to stop the bit from damaging the bore if it suddenly pulls thru the port area. don't do this without knowing the size you need, i'm talking 10 thousandths of an inch, i.e. less than thousandth go a long way
     
  6. Mad Professor

    Mad Professor Sharpshooter

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    Before you mess with the gun, what ammo are you using?
     
  7. Ignored Member

    Ignored Member Sharpshooter

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    Take some of the weights out of the buffer and see if it runs. If it does, just get a lighter buffer.
     
  8. Profreedomokie

    Profreedomokie Sharpshooter

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    I built my 300 Whisper from scratch back years ago when JD Jones was the only one selling them. I did all of my own R&D to get it to run. The first thing I would try is replace your buffer spring with one for a 9mm AR. This is for subsonic loads only. After what I learned from my build, I can't understand how a rifle in this caliber could cycle subsonics and supersonics without the fast loads beating it up. If the 9mm spring doesn't help, pull the weights out of your buffer weight and try that. My gun isn't ported like a regular AR , so some of this may or may not work on your gun. The third option would be a light weight bolt carrier.
     
  9. Shriner

    Shriner Sharpshooter

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    Call the nice people at FAT BOYS TECH or BEAR BERM for the RIGHT FIX,
    before you booger your gun up !
     
  10. Profreedomokie

    Profreedomokie Sharpshooter

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    These changes I mentioned are not permanent like drilling the port out larger is. These won't " booger " it up if they don't cure the problem.
     

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