I don't believe reverse x-valves were ever made. But I'm not 100% on that.
While the X is the most efficient AGD valve, it's also got the downside of being an AGD valve. Mags are Notorious air whores. a 68/45 will (depending on your setup) net you a hopper and maybe 6-8 pods (again i could be off a bit, I usually air up after every game, never really measured it thoroughly)
Yes AGD is great for parts. Tuna I hear is great to, though I've got no experience with him.
Last edited by bolt-action : 06-18-2012 at 12:59 PM.