jtischauser
I'm addicted to kicking ass
You are supposed to use the same equipment for the duration of the match. If something breaks you can borrow a rifle in the same division or whatever, but that's about the only time. Also, stuff like magnifiers or bipods are supposed to remain on the rifle for the whole match even if you only use them on one stage. Everybody seems to forget about that little rule.
That said, at our little local match...nobody gives a elephant dung. Sometimes I'll try out a buddy's gun if it has something cool that I've never used.
I haven't read the various rules for open lately but I'm pretty sure some allow you to add and subtract things like bipods. Don't they?