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in my case ive got the black plastic nozzle and ive put a ratech npas made for the m4 we open bolt inside but ive think i maybe got teh same issued that everybody got with the ratech aluminium nozzle the spring that retaining the npas inside is too weak for the npas so its made some fps not stable . im gonna try to put my hand on a we m4 spring and switch them to see if its better in my msk
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