Those Marlins have 16 1/2" barrels, I almost bought one a couple of years ago. This link says a 24" barrel makes the 45ACP quiet, but that's a relative term.
http://www.rhinelandarms.com/MAUSER/...onversions.htm
My intention is a backyard gun to compliment the 26" 10/22. I'd like to call that pack of yotes in one night and teach the survivors a lesson about my property.
The gun doesn't have to be truly silent, just .....well.....polite.
Uh oh, I had to come back and edit this. Seems like the barrel on that Mauser conversion that was labled "quiet" by the manufacturer is 16 1/2" as well. I asked a guy with a 24" Mauser 45ACP conversion how loud his is yesterday and I'm still waiting for a response.