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Over-heating of .30 cal suppressor?

Discussion in 'NFA Firearms and Accessories' started by Bill_Rights, Jan 20, 2013.

  1. Bill_Rights

    Bill_Rights Well-Known Member

    I am fixing to spend $1000 or so on a .30 cal suppressor. I will shoot with full-power (.308 Win) and mid-power (7.62x39mm) .30 cal cartridges. I have several semi-auto rifles, all of which would eventually get threaded muzzles to accept this can.

    Normally, I never shoot a semi-auto faster than anyone could cycle a bolt gun, but.... at any time it's easy to squeeze off a 20-round mag in well under a minute. That's a lot :what: of heat dumped in the can!

    I am willing to pay the extra money for titanium construction, over stainless steel (aluminum is flat out of the question).

    Questions are:
    1) Are there supressors intended for repeat-fire semi-auto use and which ones are they? For ex., reading the Thunder Beast (30P-1 model) info, it seems like this can is intended for long range precision shooting, not many shots per hour, much less shots per minute. Thunder Beast seems to be a preferred brand here on THR, but I don't want some fools burning up a precision can just because they don't know any better (By fools, I mean shooters I allow to use my can; yes, they are fools but they're my fools and I'll have to love 'em still.)

    2) Are the stainless steel units or the titanium units more resistant to heat?

    3) If one does, hypothetically, moderately over heat a suppressor, can it/does it recover? Seems like it might deform a bit but then resume shape after cooling down.
  2. TurtlePhish

    TurtlePhish Well-Known Member

    Buy something full-auto rated if you're worried about heat. A good suppressor can take a lot at once. I think you're underestimating their durability. One of the regulars at the rifle range I go to spends his time doing mag dumps with a .300BLK and AAC 762-SDN-6, no ill effects.

    If you DO seriously heat-damage a suppressor, it'll probably be trash. You'd have to send it to the mfg. to be repaired or something.
  3. Bill_Rights

    Bill_Rights Well-Known Member


    That is comforting. Could you be a little more specific with manufacturers and models? For example, I found AWC Systems Technology, which clearly makes some high-end suppressors for military use, and at least one in their list, somewhere, I forgot, mentioned full auto use. AWC's web site is obscure and confusing. I can call them, though. Any other full-auto mfrs I should look at?
  4. crazy-mp

    crazy-mp Well-Known Member




    Of the above pictures were demonstrating suppressors on various machine guns and how they hold up. With the machine gun part being said, your semi auto will never be able to make a suppressor glow. At the same time I would not drop 1200.00 for a Thunderbeast and do mag dumps with a AK, that is not what that suppressor was ever designed for, they make a can for SBR 223 and they make a precision 223 can (223P-1) they are made of different materials for different applications.

    If you think many mag dumps are in your suppressors future you may consider buying one that is rated for full auto, anything worth doing is worth over doing, this is a life long investment, not like buying a 400.00 dollar pistol just to check it out.
  5. Bill_Rights

    Bill_Rights Well-Known Member

    Wow! Does a pair of asbestos oven mitts come with those suppressors :fire:?

    Yeh, I get the point. If I am buying a suppressor to accomodate the rate of fire of a semi-auto, I am probably NOT doing long-range precision shooting competition. I do want a more rugged unit. I am not worried about it weighing a few more ounces (a semi-auto .308 Win rifle can be 12 pounds, anyway, what with a full magazine, big scope, bipod hardware, etc.). I also want something that if I bump it against a fence post, drop it or something, it doesn't crumple like a cheap suit. As I say - rugged. :cool:

    Any specific experience or hear-say about what's out there I could choose from?
  6. TurtlePhish

    TurtlePhish Well-Known Member

    AAC, YHM, Silencerco, Gemtech, Osprey, lots of others. Those are just the bigger names.
  7. taliv

    taliv Moderator

    oh, i think you could.

    i have two TBAC 30p-1s and they are great, but that's sure not what i would choose for mag dumps from a semi auto
  8. Zak Smith

    Zak Smith Moderator Staff Member

    Our titanium suppressors are designed for when precision is more important than rate of fire- that's the rule of thumb we tell people. The actual limitation is that you want to keep the suppressor under about 800 degrees F. Above that point, titanium starts to weaken.

    At the SHOT Show, we did show a new "30HD" model that is intended for unlimited semi-auto use, and full auto on .300 BLK, etc. Final specs to follow when it's for sale in 2-3 months. It's 7" long, goes over our BA brake mount, and is as quiet as the 30P-1. It's not Ti...
  9. Bill_Rights

    Bill_Rights Well-Known Member

    Turtlephish, Thanks. That's what I was looking for. I am researching these companies' web sites now...

    crazy-mp and taliv (and Zak), Thanks for the perspective. I realize, as I wrote yesterday, that I am really in the market for a looser-spec'd, heavy use rifle suppressor. In fact, I am not really trying to be stealthy or "silent" very much at all. I am trying to reduce muzzle report (ear damage, concussion, bystander distress, etc.), muzzle flash and (less so) felt recoil. For example, I have a flash hider on one of my .30 cal rifles that seems to increase the loudness of the muzzle report for bystanders to the sides. I doubt this flash hider would hide me very much at night, unless the observer was 500 yards away :scrutiny:. I do not have a muzzle brake, but I have heard that they deflect the muzzle blast back toward the shooter, which I absolutely do not want. My most extreme ammo so far is .308 Win with heavy loadings but still within SAAMI spec, and I do not consider the recoil from this ammo in a heavy .30 cal semi-auto to be objectionable. If I could reduce it or smooth the impulse out over time, that would be all the better and very welcome. But not the main priority.

    So, as I look at my list of desired characteristics, I concluded that a suppressor answers all three aspects at once: noise reduction, flash suppression and recoil impulse smoothing. But I am not looking for world-class specs in any of these categories. Heck, I am shooting supersonic bullets, so the acoustic shock wave (the "snap") of a bullet flying by an observer is not going to be eliminated. Likewise the flash and recoil reduction I want is not so much for stealth as to make my rifles more of a joy to use. Therefore I think I want a (or several) cheap, indestructible suppressor-like muzzle accessory for all of my rifles, starting with the .30 cal and near .30 cal ones.

    Zak, This is excellent news! The TBAC "30HD" unit sounds like it might be just what I am looking for. Particularly if the .30 cal version costs about the same as a .22 LR suppressor and can be run over by a Jeep with no ill effects. Please explain why TBAC decided this model has to be coupled with your BA brake. Seems like that would increase cost. Why not just screw it on to the end of a barrel? What is the underlying philosophy here? Please keep us all posted and/or PM me with other details, availability, etc. Thanks! :)
  10. Zak Smith

    Zak Smith Moderator Staff Member

    The 30HD will be in the same price range as the 30BA.

    The BA mount locks up tighter than direct threads. Also, we have had a lot of requests for a can that can be used on a .300 BLK SBR and an OBR and a long-range rifle. The brake mount provides more flexibility for muzzle thread differences.
  11. Bill_Rights

    Bill_Rights Well-Known Member


    Thanks for the explanation, as far as it goes. I guess I don't understand what the BA brake is or how it mounts on a factory rifle barrel. I have studied TBAC's web site but not exhaustively. So I see that the common 5/8"x24 tpi suppressor threads require a minimum barrel O.D. at the muzzle of 0.725". That's a pretty fat barrel. Is the advantage of the BA that it can be fitted to a skinnier, more "pencil" barrel? Then you can mount a suppressor on the BA? I guess I need more detail than I am finding on TBAC's web site. Any info material you can point me to?

    Given that
    and I need a 30BA on which to mount the 30HD, does that mean that my price will be the cost of the 30BA plus the cost of the 30HD? (That doesn't sound cheap :(.) Or is it just the BA mount that I need?

    Pardon my ignorance: What does "OBR" stand for?
  12. Zak Smith

    Zak Smith Moderator Staff Member

    Here's the 30BA Brake
    Here's how the 30BA goes over it

    Here's the product page for the 30BA suppressor

    The 0.725" minimum OD is to that either the suppressor or the "BA Brake" has a sufficient shoulder on the barrel to hold the entire assembly straight.

    Our BA series suppressors come with one brake; additional brakes are extra.

    This is the OBR
  13. Bill_Rights

    Bill_Rights Well-Known Member


    Thanks for the additional explanation, photos and link. I actually like the design with the stainless BA30 brake with the Ti baffle stack of 30P-1 over it. It seems flexible, in that you can use the suppressor portion on multiple rifles with a "permanent" BA30 brake installed. The open-ended suppressor can portion should be easy to clean because of the large diameter opening that screws over the BA30 brake. Does this set-up give more, less or about the same recoil smoothing/reduction as a direct-attach 30P-1?

    As to my queation about mounting threads, the BA30 brake still needs to be threaded onto a barrel. The web page you link to give the following thread options:
    One of my rifles has a bit thinner muzzle diameter, 0.692". I see from TBAC's thread spec web page that the 9/16-24 threads require a .662" diameter shoulder, which would work for that barrel. Will this work for a BA30 brake/suppressor combo or should I forget about this barrel and use more of a bull barrel? In other words, could 9/16-24 threads on my 0.692" muzzle support a BA30 brake with a .308 Win caliber apperture?

    [I realize that this is getting out in the weeds a bit for this thread. I can call the TBAC factory...]
  14. Zak Smith

    Zak Smith Moderator Staff Member

    The recoil reduction with the suppressor installed is the same.

    A 9/16-24 BA brake would be fine on a barrel with a muzzle 0.69"
  15. Bill_Rights

    Bill_Rights Well-Known Member

    rugged .30 cal suppressor research

    As OP, with your help (thanks! :)), I realized I am not in the market for a precision rifle suppressor but rather
    I have tracked down some of these possible suppressors presently on the market. I am not done yet. Then I want to call each manufacturer to ask about mounting and handling the rate of fire of an occaisional semi-auto mag dump. For those interested, here are the first four "low-end" (I might characterize) suppressors I happened to find. Please comment and/or suggest others.
  16. Gtscotty

    Gtscotty Well-Known Member

    Have you looked at the SAS Arbiter? The Arbiter gets strong reviews all around; I think my second can is going to come down to either the 30P-1 or the Arbiter, but then Again, I want a lightweight can for hunting/slow fire, so our needs are somewhat different.
  17. Bill_Rights

    Bill_Rights Well-Known Member

    Scotty, Yes, thanks. I will look at the SAS line-up.

    My latest look is at the SureFire line - very pricey! But I think even this smallest, cheapest one is rated for machine gun use. But add $129 for flash hider needed for quick attach feature.


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