[qazedx]

now that is interesting, you say that there is no point in making a steal track, well as it is my first gun I'll give it a shot. hitjohn, you believe that open track will hold the spair, but if it is so when I should use the enclosed track (I mean when I'll put more power or when I'll shorten the track)?
also I have an idea to make open track more slipery,what do you think of makeing a track a shape of sqare and puting glass in the botom? it shuold be much more slipery and it shuold not affect stability dont you think?
metelin how can the shaft stop befor comes out of the track?