Semi automatic riffles
I'll give you a free pass on "riffles"...
There is a company that makes mufflers for ATVs that cut a lot of the sound out. http://www.atvsilencer.com/index.php
But I had a wise old fart once tell me you can just take a pipe and hammer it into the exhaust pipe into the glass pack. Not sure how well it would work but it definitely is cheaper.
This post was edited on 11/24 at 5:24 pm