For anything that’s not 22 and doesn’t have the Browning tilting barrel design the I agree that ftn4 is your best choice in terms of effort vs effect.

For pistols with the tilt barrel (you’ll have to ignore my ignorance of nomenclature) the kneelsun v2 by pembletonandsons(?) that mounts via the booster from their site. it works so well I accidentally v left out the aluminum sleeve and send cut send plates and despite all the extra friction from looser tolerances and steel with rough edges on plastic it’d still reliably cycle with supersonic ammo and occasionally with subsonic ammo.

For .22 there’s several good options requiring no reinforcement or post processing. The pill popper by plaboi is a good option with a small and medium profile. With a ten inch barrel and federal subsonic ball ammo it sounds like a pellet gun until the bullet hits something solid or a spent shell makes the tell tale jingle. Almost movie quiet.