I bought a KWA G17 earlier this month. As of late, I have noticed that a rattle inside the magazine that was not there before. I can feel something rolling around inside the gas reservoir. This pistol seems to shoot fine but does not seem to have as much power as before. Is this something I should worry about? I did find something on the net about a small tube that is inside the KWA magazines sometimes coming loose but does not effect the guns functioning. I have been able to tweak the hopup and seems to have addressed the power/range issue. Has anyone else heard of a problem like this?