I played lasertag yesterday for the first time - it was a hoot. But paintball would be more fun I'm sure. The devil is going to be in the precise placement of the mirrors in the tube at 45 degrees, and what to hold them in place with.... Easier to buy one seems to me, esp for your purpose soda, b/c u want something very small and thus easily camoflauged - the smaller one u try to make, the harder to get the mirror to set right.....
You paintball guys, tell me something - I've never been. Do you have select-fire guns??? How much are they? I hear they can be up to $2,000. Any links to pics? Please tell me it's not that much fun, and I don't need to try it. I REALLY don't need to be spending money on yet another hobby - but a select-fire paintball gun sounds like a kick in the pants. U guys play capture the flag or last man standing primarily???