My Tippmann A-5 always works... I used to carry an extra ratchet just in case, but I got tired of having it in my bag. Only reason I carry two A-5's is if I have them set up differently. I never worry that they won't work. Having to carry a bunch of gear is a pain. I have a hard enough time remembering what I need to bring to play.
Last time I forgot my cup, my kneepads, and allen wrenches... DOH!