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410 is over the speed limit for all local fields. And that explains why your battery overheats, specially if it's an M120 (that spring is very stiff).
I have Never had any problems with any of my guns while using regular 'large' batteries. Mine are 8.4 volts, 1700 and 2000 MAH.
So change your batteries, or change your spring. Spring is cheaper.
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