[Masterjuggler98]

I tried it but it was so hard to get it all lined up properly, and then to get the bb to cross both the leds at exactly the right spot is asking too much for a diy build. I saw an instructable on making a very accurate chrono using that method though, but it involves printing circuit boards, which isn't really my thing. If someone here has the capability to print the boards and program the chip through, I'd buy one.

EDIT: Forgot to post a link to the instructable lol. http://www.instructables.com/id/PaintballBallistic-Chronograph/?ALLSTEPS

 

[yipiyip]

What if you, instead, mic the gun itself (for when it fires), measure the barrel length from where the bb fires in the gearbox to the end of the barrel (mine is 17"), and then set up the paper/foil/whatever to be precisely so many feet from the point of fire (since mine is 17", if I wanted it to measure 2 feet, I would set up the foil target 7" from my barrel's tip). Then it's just a matter of taking your seconds between the fire to the impact and plugging it into a short equation to figure out the fps. Do you think this would work? It seems to me like this would remove the reduction in FPS brought by penetrating the first foil marker.