Ok good stuff guys. Must be that spring setteling like you say. All my chrono tests were done with minimum hop up as .20g bbs seem to curve up even at that setting. I was more concerned that the gb wasn't functioning as intended. Springs aren't big money and I have a hand full to spare. Since posting last I have swapped springs and fps has levelled out completely. But now I have another issue which may or may not be related. Only 2 separate instances switching from full auto to semi I was getting a nice little 2 round burst. Not a double feed but two shots both with speed behind them. A cycle back and forth from full auto and everything is good. Makes me wonder what the mosfet is thinking.
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