This is how to CPVC coupler your Sonic Bazooka.
PLEASE DO NOT POST UNTIL IT IS FINISHED.
Here it is.

Unscrew it and it should look like this.

Now take out the tank and set the pump aside.

Now cut carefully around the base of the stock barrel, but only through the white plastic.

Pull it off and you should see this.

Now sand down all those nubs around the blue piece.

Go grab a CPVC coupler and glue it on (I recommend something strong like Plumbers Goop or epoxy, but hot glue and superglue would probably work too).

Now grab the pump shaft.

Plug the middle hole, but be sure to leave the other two open. Those two holes let air get back into the pump casing so it can compress more air.

Now that everything is done all we need to do is put it back together. Sand down the walls as shown in the following picture to accept the new coupler.


Now screw it back up, and you're done! I would recommend six pumps, and a six inch CPVC barrel. Those of you who like pushing your guns to their limits could probably get away with 7-8 pumps, but I personally don't want to risk it.


Now to make this war-worthy you'd probably have to cut off the top half of the front of the gun (everything past the wall where the coupler is). It's hard enough to find the coupler while test-firing, I can't imagine trying to do it in the heat of battle.
I don't have any ranges, and probably won't for the next couple weeks (going on vacation). I'm guessing something in the 60'-80' range. You could try to shorten the barrel to increase range, but I can't really vouch that it helps at the moment.
Questions? Comments?
Feel free to post.
-OfAll'