At the risk of starting an argument , My 22 mutant was so quiet when I first shot it I thought air guage was wrong. The Marauder is kind of a standard for quiet . Deping it , and install hammer bounce kit and it's very quiet .
You can find a few guns that are quieter , but it's a double in price type of step up . I installed a Tim Hill baffle kitin my 25 Mrod . Helped without adding length to shroud