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nothing.
I used lipo in a plastic bushing JG HK416 for the longest time without a problem
all the gearbox needs is a proper shim job and that's about it.
people usually say that the gearbox doesn't last as long, but the real reason is that it lasts just as long.
for example, if the regular tm gearbox would last 50000 rounds with a 350FPS spring. Whether you are using Lipo, 8.4v mini, or 12v large, it's still going to last 50000 rounds, it just seems to break faster with lipo because you will fire 50000 rounds at a much faster rate than you would with an 8.4v mini.
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