I was experiencing a twang like sound everytime I fired after an upgrade was done. Eventually my aeg stopped firing after less than 200 rounds. As it stands the screw that was holding the piston to the piston head had come off on the inside of the piston and fallen into the spring and jammed it. The twang sound was actually something rattingling everytime I fired. This may not be your case but it doesnt hurt to check.
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