I am looking at getting an M&P 9 for IDPA, haven't shot in comp of any kind in 7 years. Question: if I get an M&P 9 and have Burwell do a trigger job and sights, this will no longer be a service class wepon will it? I forget the rules, it's been a while and I use to use a stock Glock 17. Has anyone used an M&P 9 with any mods in IDPA, and also anyone use the M&P 9 stock out of the box in IDPA? Thanks for the info.