The purpose of this mod was to make slide pump guns such as the at3k easier to pump when they are plugged. I think it turned out well.
Anyway, as for the 3K, flow-rate isn't the limiting factor. It's pressure (and I think the seal, but I'm not sure). The design of the pump makes it more difficult to get as much pressure built up compared to an AT2K or other pump guns that have an exruting pump (instead of a sliding pump, like on the AT3K, AT4K, and SM3K).
6-7 inches of 1/2inch OD aluminum pipe
3 in of 1/2 cpvc
1/2 cpvc endcap
at3k or similar slide pump gun
1/2 inch drill bit
glue of choice
dremmel of round file
First locate the pump and take it out.
Now drill through the hole shown with the 1/2 inch drill bit
Once you have done that jam your aluminium into the hole you drilled.
Now to make room for the aluminum you need to cut this piece out of both sides of the shell.
You are also going to have to close up the shell and take your drill and make another half inch hole.You are also going to have to file it down so it doesn't rub.
Next you need to cut the aluminum to size and drill out your cpvc to fit over the aluminium and glue it on there.
Finally slap on the end cap and put on some barrells if you haven't already.
It is now much easier to pump up the gunto high pressures because of such a smaller amout of friction on the new pump handle.
Edited by veginator, 26 November 2008 - 07:06 PM.