While searching for a barrel for nerf balls, I discovered this acrylic barrel material at Tap Plastics. I was in a rush and only bought 1 foot and so far it has worked great with my homemade. The price is extremely cheap compared to brass and PETG at only $2.50 for 6 feet! It has a 5/8" OD and 1/16" wall so that makes a perfect 1/2" ID. It is also much more strong and easy to cut than PETG. Like brass, the sizes fit perfectly together.
If you can't find a Tap Plastics near you, you can order online at http://www.tapplastics.com
The link to the acrylic tubes is here.
At the store the people are very friendly. They gave me a green, 4' peice of nerf ball barrel, 1' of micro fitting barrel, and 1' of mega fitting barrel, all for free.
Edited by earl_the_bunny, 13 May 2004 - 05:14 PM.