Doom, on Apr 21 2010, 03:02 PM, said:
Hanging weights from a length of foam is one method of straightening foam. A side effect is that if done incorrectly, the foam's diameter could decrease. You could try that to intentionally decrease the diameter.
However, it is easier to find barrels that fit your preferred foam. Try some different barrel materials. Also, try some different foams if you prefer CPVC.
The first is a good idea but I don't have that much time. I need them by tomorrow.
The second isn't really possible because my gun is already made and also I don't have that much time.