Hi guys need some advice, managed to fit a ra-tech inner barrel and hopup rubber, and with help from EVG31337, I managed to install kjw m4 npas kit. Only prob was when putting back together I accidently stretched the cylinder spring. It all seems to still work but what are the effects long-term. I'm a novice with gasguns so unsure.
Thanks for the advice.
From a foggy UK have a goodone.
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