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The hex size is 3/8" Yes, the puncture pin assemply just screws right out. It may be a little stiff - in the future toss a drop of oil on there and your o-ring will last longer if you change from 12-gr. to CA frequently.
Size of the tank has no relation to the output pressure since you're dealing with a saturated vapor. You could run a 40 lb. CO2 tank if you were willing to carry it... No regulator needed, though you will get *slightly* better shot consistency with one, depending upon what regulator you use. Another thing you can do is to use the regulator to fine-tune your velocity to put it right up to the limit if you really want to do that.
As to balance, you'll appreciate a smaller tank just because of weight alone. No sense putting a 2-lb. tank on a marker that weighs less than 1.5 lbs, right? Plus, keep in mind that the money you'd spend on a bottom line or a regulator could easily be put to a 3.5 or 4 oz. tank (look to spend $25 on a tank vs. almost $100 for a good reg/BL setup). As for number of shots, is 300-400 plenty for you? If so, don't worry about getting more than a 4 oz. because you won't need it.
People use the 4 oz. tanks because they cost $25, screw directly into the ASA, have about perfect balance, get plenty of shots and, most importantly, save you money on 12-grams. One $2 fill of a 4 oz. contains roughly the same amount of CO2 that 9.5 12-grams contain. Or about $4.75 if you buy them at 50 cents apiece. Just think that you'll be saving $2.75 every time you use it. How about fields that have free air? If you play at one of those, you could pay for your 4 oz. tank in savings just by playing 4 or 5 times.
Smaller CO2 CA tanks are ideal on phantoms (other pumps, too) because they're small, light, balance the marker well and save you LOTS of $$$ on 12-gram bills. Just buy yourself a 3.5 or 4 oz. and don't worry about it.
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Before: "You're playing with WHAT?"
After: "Crap, it's that guy with the pump!"
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A few Phantom Questions
