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opening up gas port


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I have a mka1919 xn. I have cut the barrel and silver solder a tromix muzzle brake on it for a total overall length of 18 1/4 inches.it will shoot 1325 fps shell 100%, it will not shoot 1200fps. the gas booster rings (2) did not helped and where removed. I don't want to install a low power spring. I know I have shorten the dwell time. should I open the gas ports and if so how much? thanks

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