If you can fit 2 lipos in your stock, I would suggest you running them in parallel. You will absolutely murder the bejesus out of a 15c discharge battery with that setup (anyone who doesn't believe me, try it with a lipo alarm or a watt meter, it'll start dipping below minimum voltage really, really fast when shooting in semi).
600mm barrel is overkill. How long is the outer barrel? Just go with that length.
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I change primaries like other people change socks.
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