if you are using a 11.1 lipo then it's possible you're getting overspin... so much speed and momentum on the gears on a weaker spring could be easily getting a shot plus a partial cycle. Combine it with tight trigger gate and you could get a stuck shuttle that squeezes off a few rounds instead of one.
Push the shuttle all the way into the trigger prongs and see how tight it is. You can try prying the prongs apart just a bit so they just make contact with the shuttle instead of pinching it.
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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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