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Hello I have a m3 .357 and i have some problems when i change over to .30 600mm , i can't get it over 840fps @44 hybridslug. Have tested all setting inc regulator from 100 -150 bar. C1 is 6.3mm, Any advice?

Hello Hello I have been looking all over the internet now for anything for a .35 build on a mk1 impact I got all the parts from my dealer here in Norway , but i have some questions about the rebuild * Hammerspring, use the 57mm or the short one that comes with Powerplenum kit + 2x spacers...