Most that I have seen would be 1/2 inch UNF. This would be the same thread as almost every 22LR sold. But if it was threaded by a Gunsmith after purchase, this may need to be checked in case it was threaded differently for a reason such as fitting an odd ball suppressor. 99% of 22LR threads would be the 1/2 inch UNF so would definitely be the first thread I would check.
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