wow what quick replies, thanks everyone! That helped a lot, I'll keep that regulator and Expansion Chamber thing in mind!
And yes, my dad bought it at a ****'s Sporting Goods, which is a major sporting goods store, so yeah.
Thanks for the welcome!
EDIT: here's the name of the store, the swear filter caught it...just trying not to get in trouble: http://www.****ssportinggoods.com/home/index.jsp