Algodoo

This is my rendition of a gun with a telescopic bolt, I will eventually make it a sub-machine gun, but for now it's using a shotgun shell.

If you "do not" know what a telescopic bolt is
http://telescoping-bolt.co.tv

I cannot seem to get the springs, or weigh of the bolt and shell, set up right to create enough recoil to eject the shell. If someone could help with this I'd be grateful. I would like a scene response if possible (to show how you got it to work right).