As a rule of thumb: a .223 Silencer will work for .22LR (it's overkill, and the .22LR will dirty it up more quickly) But the .22LR silencers will not work for .223. The pressures are higher, and therefore the volume of gas that needs baffling is too great. You'll do bad things to that silencer. There's a reason .22 Cans are much cheaper than .223 cans.
This belongs in the NFA Section, IMVHO.
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