You would need an aftermarket .45-10mm conversion barrel for the G30 with G20/29 magazines, and you may need to modify the extractor. Here's another thread about it, I've never seen the extractor modification discussed openly, it seems KKM sends out a piece of paper with the barrel that gives instructions on how to modify the .45 extractor to work best with both the original G30 barrel and their .45-10mm conversion barrel.
G23 G27 .40 S&W Club Member# 4520
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Last edited by voyager4520; 04-19-2012 at 12:04..