if your getting a 22lr suppressor be sure it is easily serviceable by you. as few as 1000 rounds really starts to junk one up. centerfire suppressors will run for nearly 10,000 shots before it starts to degrade in performance.
the silencerco sparrow SS is in my opinion the best 22lr suppressor on the market. the outer sleeve is the registered part. its got two inner clamshell parts surrounding the monocore baffle. the shells and core can be cleaned using an ultrsonic cleaner.
do not run 22lr through a centerfire suppressor. centerfire versions are typically not user serviceable.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith