Yea they are. I find I use them more on 22's the most. I gave up on AR's. I use them on my bolt guns (308) and even a 45-70 lever.Suppressors are very addictive. Hard to have just one. I really never gave them much of a thought but when I got my first I looked at them totally different. I started selling guns a buying replacements just to use suppressors. Still not into them for standard pistols other than home defense and 22 cal.
I would not buy a firearm unless it was threaded.