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I need a little help please i recently installed an m125 into a AIM TOP M4 with a 300mm inner barrel. My hope was to get around 400-410 fps, i ended up with 330fps. As a result i tried a Prometheus m110 and got 340-344 fps. My air seals are 100% no air loss and the flow coming out of the gearbox seems to be on the dot. can anybody give through me a ball as to what the problem might be?
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Legion XIII
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