Open up your cliptek the internals should look like this. I added fbr to a few places to help silence the gun.

Even if you don't want to silence your gun I must recommend adding Fbr around the stock barrel like so.

This will make sure the barrel stays still.
Next take out the plunger and wrap e-tape around it then add a size 13 o-ring. You might also want to replace the spring. ( I used a double shot spring) That should look something like this.

Now put the gun back together and you should see a range increase. The next part of this mod will be internal banding and possibly a PVC barrel replacement.