I just recently sold a G36 with a 120S spring, systema helical torque up gears and a magnum torque up motor with a 9.6v. Even though you're not upgrading the gears and it'll still get consistent FPS and a much better ROF, but nothing too nuts. Nothing but good things about the magnum torque-up though, the magnet is so strong I've used it to pick up springs that have fallen onto the carpet.... That's just a bonus feature though.
You can also get a 1400 9.6v if you don't feel like converting to a large battery, it fits as well as a standard 7-cell mini
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