Suppressing a 22 reminds me of when I was a kid, and we used to put a baby nipple on the end of our guns to suppress the noise from our neighbors. We would cut an "X" in the end of it to make a slightly larger hole. It worked pretty good too. Then we started to get serious and started making them out of pipes/conduit with washers, steel wool, wood dowels with holes drilled in them, etc.. inside as we experimented. Eventually we eliminated all (or most) of the noise coming from the barrel. It was the damn noise coming from the receiver that we couldn't suppress.