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KJW M4 GBB Help
I just received my KJW M4 GBB Ver2 in the mail. I haven't had the chance to shoot off any rounds yet, but love the kick it has, the weight and feel. Upon inspection I noticed that the grip is hallow and has a valve at the top. Looks like a gas valve, however the gas is obviously filled into the mag.
Can anyone tell me what is supposed to go in there? Yes I am an a complete airsoft n00b.
Thanks in advance.
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