25 rps on an 8.4 is pretty easy to achieve especially at 300 fps. Either by faster gear ratio or faster motor.. since it requires so little torque to turn over the m80/90 springs in the stock TM, a faster gear ratio will get 25 rps easy.
You can lego build 30rps these days without much trouble, my p90 is proof of that.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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