Heh, I'd assume (and hope) that it wouldn't be possible to bump up the power beyond airsoft levels - else the gun would be something else entirely and couldn't be sold through existing channels to the airsofting community, let alone the danger of accidentally/deliberately bumping the power in a game. Beyond that I shudder to think what it would do to hops, seals & monkey metal airsoft guns are made of!
377fps+, legally speaking, is an air weapon anyway. You're tanaka is by definition an air rifle. Albeit a crap, low powered one(as air rifles go, anyway. A fine airsoft rifle - if not the most accurate). If you want to be humane, stick to the air rifle, seriously!
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My armoury;
Tanaka Kar98(1942 woodwork and parts), M1 Garand AEG(1940's woodwork and metalwork), MG34, SVT40, Mosin Nagant M44, MP40, PPSH41, Luger and PPK.
Power variance, given that this is G&G we're talking about, would most likely be taken care of via a PCS powerbolt. They have made them for the Tanaka M24 and M700's for a while now, so they have considerable experience of doing it that way. Why would they try something different if they have already made something that they know works well?
When we were a Kingdom it was run by a King
When we were an Empire it was run by an Empress
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