Originally Posted by
clm2112
Using the tip of the barrel as the flat surface the tighten against. Usually you want a shoulder cut into the exterior of the barrel to tighten against. But when the barrel diameter is just about the same diameter as the thread, there isn't enough material to make a shoulder on the barrel. So, the alternative is to pick another place to tighten against, like the muzzle. (The actual "shoulder" ends up being inside the suppressor instead of being on the outside of the barrel.)
I'm not sure if this approach would work for the OP... who wants to run a commercially made suppressor on the barrel. You are pretty much stuck with how the suppressor is threaded and how they expected it to tighten on the barrel.
Now, some suppressor makers use a proprietary thread to allow a quick connection of the suppressor to the barrel, then use an adapter that is supposed to be permanently installed on the barrel. In this style, you may be able to use no shoulder at all (brazing the adapter on or staking it with distorted threads to keep it on the barrel.)
Edit: I went and took a look at Thunderbeasts' web page for the Ultra 7 suppressor. They have what they call a "CB" mount, which is a custom muzzle brake that stays on the barrel when you remove the actual suppressor. So, you could have the barrel muzzle threaded 9/16th-24, install the CB mount/muzzle brake, and braze it in place to make it permanent. They are a little pricey, at $125 per mount, but compared to the price of the suppressor itself, it might be a good option. You could also add adapters to additional barrels and share the expensive can on multiple rifles.
To the OP: I should have read your post a little closer... you already know about the CB mount. That is really your best option, since the CB mount is the same thing as adding a sleeve to the barrel. The CB mount is the sleeve and it provides everything the suppressor needs to tighten onto the barrel. Considering the suppressor make is offering to thread & install the adapter for you, I'd take them up on the offer.
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