With all this talk of Ammo boxs thought I'd lend my recently aquired knowledge.......
While Warps are the first thing that spring to mind for a box mag I wouldn't reccomend it, for the reason that they are just too big. On the other hand Draxxus Pulses definitely have enough power (trust me-I'm in the process of making one of these myself). They are also very easy to use.......just slip out the drivetray and connect the battery pack to it. Haven't tried it yet with the 9V configuration but the standard 6x AA's definitely work. Also the RF chip means it will always be in time with your marker....pretty beneficial when all other triggering systems are geared towards downwards feeding! Apparantly Empire Reloader B2s work as well.....but I have no personnal experience with them so I won't comment.
THE MOST IMPORTANT BIT TO GETTING THIS SYTEM TO WORK IS THE TUBING! You want to use the minimun possible of it......but also get the curves right. I personally find that running the tubing vertically with a 90 degree elbow on each end works best.....but someone else might have found a superior way.
Anyway if you want any help with this PM me I'm only happy to help (can't guarantee I will have an aswer though as mine isn't quite finished yet!) but I will try to be useful as I have made a lot of (expensive) mistakes!

That looks good!

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That's one sick gun.

nice like the new ones from future weapons

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duces!!!!!!!