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A-TEC CMM4(6) .22LR suppressor can take a lot of abuse!

Discussion in 'NFA Firearms and Accessories' started by Odd Job, Jun 30, 2017.

  1. Odd Job

    Odd Job Moderator Staff Member

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    v35 likes this.
  2. wally

    wally Member

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    How much does it weigh now, compared to what it did brand new out of the box?

    Edit: Your link didn't work until I turned off my script blocker, I see its gained nearly 195 grams of mass. So my question becomes how much did it weigh initially?

    This gain is nearly 7 ounces! or a bit over 3000 grains. Would have been most informative to have "standardized" 10-shot average db ratings when new and at various intervals. Noise suppression is the point of the thing.

    If our HPA passes I'd love to buy "disposable" .22lr suppressors instead of hassling with cleaning them. your weight gain is in line with what I scrap out of my Sparrow every 800 rounds or so.
     
  3. Odd Job

    Odd Job Moderator Staff Member

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    It started out at 130g.
    I don't have the equipment or expertise to test db on this but I have made contact with an engineer who will help me when I do the next batch of suppressors (I bought 10 more cans of various types all in .22)
     
  4. wally

    wally Member

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    Wow, So its more than doubled in weight!
     
  5. Odd Job

    Odd Job Moderator Staff Member

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    No, the base weight when new is 130g. The current weight is 194.8g.
    So it has gained 64.8g over 23000 rounds.

    See the attached spreadsheet...
     

    Attached Files:

  6. v35

    v35 Member

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    I did!

    Now we know what noise weighs. You could theoretically add a mg/dB value to your calculations.

    :cool:
     
  7. Odd Job

    Odd Job Moderator Staff Member

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    I would like to find a cheap way to measure db myself. So far it seems a complicated process to do it, requiring expensive equipment.
    I need to look into that some more.
     
  8. UhKlem

    UhKlem Member

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    Thanks for doing this work. A friend who mainly shoots bolt action .22lr recently got his Form 1 approved for a .22 suppressor and he has been long stuck in analysis-paralysis over build materials and making the can easy to take down and clean. I've been telling him that I've seen sealed .22 suppressor continue to work for over a decade and for his style of shooting a simple build will be just as useful as an over engineered one. Your radiographs tell the story quite well. It's nice not to have to mess with lead contaminated internals. A couple of ounces of fouling over 23,000 rounds is no big deal and for low volume shooters that's a decade or two of plinking or pest control.
     
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  9. Odd Job

    Odd Job Moderator Staff Member

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    I agree!
     
  10. Odd Job

    Odd Job Moderator Staff Member

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  11. Odd Job

    Odd Job Moderator Staff Member

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    Small update: the suppressor has now had 30500 rounds through it and weighs 99g more than when it was new. Still going strong, but look at the residues on the radiograph. How much more can it take?

    Wy0i0tz.jpg
     
  12. Odd Job

    Odd Job Moderator Staff Member

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    Now at 34000 rounds and still going strong. Weight gain is now at 108.8g

    upload_2018-10-9_15-26-5.png
     
  13. MachIVshooter

    MachIVshooter Member

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    That's a lot of build up!

    I keep trying to explain to people that cleaning of suppressors is way over-stressed, that they work just fine even when absolutely filthy.
     
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