A spring might have more unused space - depends on how much it's compressed.
I suspect they didn't want a bladder, as constant pressure is actually bad here. Using a spring means that you can get more force the harder you pump.
I'd also say it's more difficult to use a bladder for such small volumes. I'd be interested in making a similar gun that used a bladder instead, but you can't really control the duration of a burst with a gun like this. I'd prefer having something that doesn't use water unless you want it to.
I'm thinking they used a spring because an air pressure design must have been patented. As I've said, I've seen one - it's actually in my backyard because my neighbor left it out (he doesn't really care for the gun). It's performance is terrible, but I'm sure BBT pulled it off properly.
Steady stream - piston based bliss
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