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All i've done to mine is put in a MB tightbore, which is working just fine, must have got a good one. Other then that, haven't really done much to it other then cosmetic stuff (as seen in my sig below), oh, and removed the fuse, that was the only thing that caused me any grief. And to date it has seen at least 20,000 rounds, and out lasted my CA M15A4.
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