I would say its definitely not a normal issue, from my experience and others I have seen around the web it is built like a tank.
Was it like this ever since you bought it from the other person or do it just begin to have this problem recentl?. I would venture to say that it is due to the previous owner.
I was pretty certain it was because the previous owner did some tinkering somewhere down the line. I hope this doesn't tarnish your opinion of the weapon (even though you found the "problem") and you enjoy it from here on out.
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