The true bottle neck on ROF is not the mechbox, but the BBs feeding mechanism. Fast firing needs a fast and reliable bullet feeding mechanism. How fast can your magazine feed? Our experience shows that low-cap mags feed very fast but can be easily emptied in less than two seconds. Hi-cap mags feed slower and tend to be less reliable.
One recommended way to improve the feeding mechanism is to replace the stock plastic hopup unit with a one-piece metal hopup. Field reports show that the one-piece type of hopup tends to allow significant ROF improvement and almost-complete elimination of mis-firing. Not all gun models have this kind of chamber though.
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