I'm getting back into shooting after a long absence, and would like opinions about the handgun I just purchased. (I'm still in my 3-day waiting period, so have options.) I originally purchased a Walther P99 in 40-cal, because the fit in my hand seemed perfect, but then had second thoughts, due to: 1) a future need to conceal-carry; and 2) a desire to get involved in IDPA and match shooting. So, I changed out my purchase to a HK USP9C in 9mm. I know it's a good gun for concealment, but is it a solid choice for IDPA competition, with its 3 1/2" barrel? I know nothing about IDPA and "preferred" guns.