Nerferc

I've asked this question in several different places and I have also read CXWQ's article, but I still do not completely understand the question. What Barrel is use for what? This may sound vague so let me elaborate. I use micro stefans(made with 1/2" FBR) and I have the choice of cpvc and pvc for my guns(I can't get brass). In my spring guns(like my NF)I understand I want some sort of constriction so I should use CPVC. What about in my AT2k it has a high volume of air so I don't want as much constriction correct? But the 1/2" FBR seems to be too loose of a fit in 1/2" pvc. I am also building a high volume homemade spring gun. It is spring and outputs a high volume of air. Do I want constriction or a long barrel?

I have read alot about barrel constriction on spring guns. How exactly does this help and is there a way to do it with pvc/cpvc (I can't get any brass).

I'm building a spring powered gun(basically a rip off of boltsniper's). I need a simple catch/trigger mechanism. Do you guys have any ideas that wouldn't need me to build a frame?

I've been looking all over for a mod the the at2k for a tank expansion, and I can't find it. Could someone point me in the right direction?

I posted this on NHQ a little while ago and I did not find an answer. My dad doesn't want me shooting something with a peice of metal in it. So I was wondering if there was a way to make a stefan without putting metal in it? Hot glue alone doesn't get it heavy enough. Help?