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I'm not familiar with the K18 but I have notice that many of the newer M4s are now coming with what is called upgraded internals included M120 springs. to name some; Echo1 Platinum Edition M4, VFC MLL M4s, JG, Etc.
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I must not fear. Fear is the mind-killer. Fear is the little-death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me.
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