QEV coaxial air cannon diy details

This video is kinda boring so please consider it a beta version. It's intended for the deep understanding about pneumatic coaxial cannons, and a description of some aspects about my own coaxial cannon, and the discoveries I made with it. Many things remain unclear, but the one that may be most useful for DIYers is the use of a bike pump as source of the main body, rear cap and piston. Also, the use of silicone as sealing face seems to work far better than the all common rubber option. If you have read the description so far, hopefully this video won't bore you too much...it's kinda long...