I know most of the usbp guys pretty well. They all use chromized 1911 5 and 6 inch 9mm guns. They also use Springfield ultra compact and emp for off duty. I know rob Vadasz has an xdm 4.5 barrel for production and would have advised a national record or did score one... Not sure. I strongly believe you can give those guys any customized gun and they will kill the X ring. They use Atlanta arms 9mm 115gr hp as well as federal.
I have an xd mod 2 3.5 inch back up gun and I love. That is a good choice.
Their revolvers are of course Smith and wessons.
Good luck at npsc. A team mate of mine from the Tampa PD team will be there this year.