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I currently have a Sig P226 E2. I am thinking about having some mods done...but in the future I would like to get into ipsc/uspsa. I have read their website but cannot find the info I am looking for. On my Sig, I am thinking of having the Tru Glo TFO sights put on front and back, a trigger and action job done by our own Robert Burke and replacing the plastic recoil rod with an all steel. I am just wanting to make sure that I do not do something to this gun that would keep me from using it in these competitions in the future if I chose to do such.
Thanks for all help

You should be good to go for USPSA. The specifics can get lengthy: http://www.uspsa.org/uspsa-rules.php. The first link on that page, a PDF file, says it's the 2008 rules revision, but it's really the 2010 version. Appendix D gives the rundown on permitted modifications by division.