I have a Huntertown Arms Guardian in the transfer process. It looked well made and seemed as quite as anything else in the 22 cal market.
It's reasonably priced and I have not had issues with aluminium based baffels in other suppressors on 9mm machine guns, so this should be fine for a 22 semi-auto.
My .02 is I as much as I hate to NOT support the small guy, but I have 2 cans from smaller manufactures that are no longer in business and therefore no longer repairable - THANKS ATF/Gemtech -, the threads are torn out - aluminum threads. And since Gemtech was part of it I will no longer support them either.