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all of the rules for the various competition shooting organizations?
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Wow, that would be a very large book! I can help you with a couple: IDPA and USPSA (IPSC).
I shoot IDPA/SSP and USPSA/ Production with the M&P 9 Pro, which comes with the sights and trigger for these sports. Some people buy the L if they intend to put in the APEX kit and some particular aftermarket sights they prefer; why pay for something you're going to take off?
The reason I use 9mm in these two is that both require only minor power, and there's no point shooting .40.
All are legal, some just better suited than others.
Now if you wanted to shoot Limited 10 in USPSA, .40 is an advantage because of major power scoring considerations.
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