Personally I'm looking at a tightbore for mine, based on my experience with stock powered full size AEGs; without adding power you can at least group shots useably at a longer range, allowing you to arc shots a bit more (which does extend range).
The battery life and ROF are actually pretty nice, so I don't want to go to a much stiffer spring.
Totally stock, it performs similarly to a blue gas (duster/hfc134a) -powered pistol, and if used that way (which is pretty much like the real one; CQB and defensive weapon) I think with the tightbore it'll be useable outdoors (non-gas mid-range pistol with mad full auto reliability/useability in all weather).
(I plan on using it as a complimentary weapon for closer range engagements when fielding my very upgraded SR).
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