Whats louder, a sniper or a phantom.
it TRULY depends on the gun and setup you're using, you're going to get varying stories all across the board with this one...
notoriously quiet guns out of the box include:
you can basically spring and valve any sniper to be super quiet, blazers are very quiet out of the box, all you need is a pump kit ($70), phantoms can be made to be quieter as long as you have the right barrel for it, and the old WGP stock sniper 1's and 2's work well as long as you have a newer ported barrel, otherwise they sound like cannons...
i have played with and own most of these guns so you can be confident in what i'm telling you...i hope you find what you're looking for, good luck and happy pumping