Okay, before I start let me say this: I have never liked the idea of polishing a chrome lined barrel. But with all the stuff I read on here, I got to thinking. I read of a couple guys that have polished a chrome barrel, but they use a little different method, NO ABRASIVES. So, that being said, I decided to give it a go. Basically, I used the method on here with a drill(low to medium speed), but with a bore mop and some polishing CREAM, not compound. I made about sixty passes(one pass=down and back), and kept plenty of cream on the mop. It is a very messy process. I patterned the gun a few days ago and shot 176-199 in a 10" circle at 40yds with a SBE2 and 3" MagBlends. The pattern looked noticably tighter, but when I sat down and counted it came out to about a 10% increase. Not huge, but a step in the right direction. Plus it was just fun to try something new. I still say that doing this to a chrome lined barrel is risky, and will probably toss your warranty to the toilet. Patience and time, and remember it's like cutting a board.....you can always take more off but you can't add it back on. Err on the side of caution, and if you don't feel comfortable doing it......THEN DON'T.