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I cleaned my SUM with Sweet's every round for the first 5, and I was pulling some copper out for the first 3 shots. Whether that ended up in making my barrel shoot better or not is questionable, but it was my experience. I can run 40 rounds now and not get nearly as much copper out as I got from the first round I fired through it (and I'm assuming Mike Milli put a few rounds through it after he built it up). /ubbthreads/images/graemlins/confused1.gif

[QUOTE="Evil_Lurker, post: 879137, member: 11756"] I cleaned my SUM with Sweet's every round for the first 5, and I was pulling some copper out for the first 3 shots. Whether that ended up in making my barrel shoot better or not is questionable, but it was my experience. I can run 40 rounds now and not get nearly as much copper out as I got from the first round I fired through it (and I'm assuming Mike Milli put a few rounds through it after he built it up). [img]/ubbthreads/images/graemlins/confused1.gif[/img] [/QUOTE]

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