Making some what good BB barrel is easy.
Materials:
1x Prefered length of 1/2" sch 40 pvc
1x equal length of 3/8 inch air hose(the orange kind)
1x small can of WD40 or similar plastic safe arisol lubercant
1x Common Since
You can also slice the hose lengthwise and remove the white part for larger BBs
You can put a piece of screen at the end to prevent the bbs to fall back into the chamber.
Start At The Bottom
Simple 1/4" BB Barrel Sleaving
nice job with the barrel... although i think it would be a little easier just to use very thin copper piping for the bb gun barrel. that just makes more sense to me at least.