Quote:
Originally Posted by Erennert
I'm looking into a G&G M4 CQB...my question is with the advanced version, is the compression problem fixed? Or do you have to replace it as well.
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They all seem to have a poor design of piston head.
But to clarify, you don't NEED to replace it for the gun to work. They work fine with the current one. They will work BETTER with one that properly seals.