Is a Tanto, enough for a PT. KGC in .25? (not a trick question)

I don't believe it would be. I have run my Tanto, directly threaded, on a 50fpe P15 and I wasn'tthat impressed. I put the shroud back on, with the adapter, and I can live with it, because of its size; but it's no Sumo. It all depends on what you are willing to put up with. It was too loud for me and I'm sure your power tuned Cricket has a whole lot more fpe to silence, so, good luck with that!

May I suggest having an expert such as Derrick ZX10WALL answer your question.

If it were ME there would be absolutely no question about the huge long Huggett Magna as being my first choice and a Donny Emperor as the second if I could not obtain said Huggett anywhere in the USA..

Sounds like your .25 Cricket with a KOI is considerably quieter than my .22 Marauder pistol, also with a KOI.

I think that a Tatsu would work better than the Tanto, but not if you want to stay skinny.