I bought an adapter from a reputable place once, and it made my suppressor go consistently crooked. I am hesitant, to this day, to consider using one.
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I bought an adapter from a reputable place once, and it made my suppressor go consistently crooked. I am hesitant, to this day, to consider using one.
There's so much to learn about the performance of a suppressor that's it usually easiest to just call up a reputable dealer like the Silencer Shop, tell them what you want to do, and let them tell you which cans are a good match for you.
Buying a can, then having someone other than a silencer company copy the baffles out of a material not used by the silencer manufacturer is not going to have the effect you'd hope it would, regardless of the legal question. Just stick with off-the-shelf, proven silencers made by reputable companies that are made to handle your intended purpose in the first place.
FWIW, the vast majority of 9mm cans handle subsonic 300BLK quite well. They are overbore (357-ish vs 300-ish), plus, the pressure will be much lower by the time a 300 BLK bullet reaches the can at the end of your 10" barrel versus a 9mm bullet at the end of a 5" pistol. Baffle erosion will likely be less with subsonic 300 BLK on a 10" barrel than what the cans are actually designed for.
A few, like the Liberty Mystic, already come made with materials tough enough to handle limited full power 556 and 300 BLK use, but you pay for that in weight over titanium cans like the Liberty Infiniti.