It is REALLY MOUSEFART QUIET with a Huggett Snipe at the end with a Donny 1/2 unfx20 adapter (Huggett Belita is enough too NOT MOUSEFART but REAL QUIET). Quieter than the HW44s in both calibers with factory HW LDCs and the FX Ranchero with a Sumo.
Here is where we are going to differ. I have a Bellita I've used on my AP16 and let me tell you it isn't 'real quiet' to me. It still has quite a pop to it. Tanto is good. The Koi is definitely in gassy mice territory.
CT shooter! YOU ARE SOOOO RIGHT! I DOUBLE CHECKED MINE AND IT ACTUALLY HAS A MINI MAGNA AND NOT A BELITA AS I HAD PREVIOUSLY SAID! MY BAD! THIS SHORT BITCH IS FAT!