We carry a wide selection of night sights http://bit.ly/jBqT9C
TruGlo fiber optic tritium are very popular http://bit.ly/p08wB1
I like them because they work the same as any other night sight but also glow durring daylight because of the fiber optic rods.
I am really disappointed with the IDPA rule system. Seems to me, everything is illegal in that game. You need to verify with their regulatory board to ensure anything is legal or not.
BTW: I would NOT change anything on your duty gun without prior approval of your department Armorer. If they ok it, sights and triggers will provide the most benefit.