You begin by taking the gun apart. Now, the trigger mechanism is simple, but still, DON'T FORGET HOW IT WENT TOGETHER since it will come apart in a bunch of pieces.
Next, pull the barrel off the dark grey box-like trigger mechanismand replace it with a 1' piece of 1/2" CPVC (it must be CPVC or else you won't get an airtight seal)
next, there is kind of a wall where the stock barrel went through, the hole is too big for the cpvc, so wrap the part of the CPVC that passes through that hole in masking, duck, electrical, scotch, whatever tape so it's a tight fit.
now, with thirty pumps, and the dart rammed down the barrel, it should get good ranges, mine got 100-120' flat.
And this is what it'll look like when you're done:
![Posted Image](http://img51.photobucket.com/albums/v155/loanwolfe_tinkerer/IMG_0022.jpg)