odviously this is just a quick sketch (if it actually shows up) but you get the idea. there would be a hole through it, and all the sides would be flat, and solid. but sketchup is NOT that user friendly since i started using inventor at school... (mac vs pc compatiblity errors SUCK) but anyway, this would more be if you were , for example, try and make a semi automatic maverick, or whatever suits you with a rotating barrel. but there would be a spring behind it and it would move up and down and you would get a better seal, theoretically.
Edited by hulianomarkety, 14 January 2010 - 05:13 PM.