Here is a pretty neat example of an IPSC (International, Not USA's USPSA) gun for their
Modified gun division.
Modified division is kinda goofy. It has to be 40 cal or bigger to get Major power factor scoring, and has to fit within "the box" with the mag in it.
The box is rectangular in shape and folks come up with creative ways to get magazine capacity while still running a red-dot and some compensation/porting. The division has never really caught on (because you are innovating to an arbitrary standard..."the box"...IMO), but you see some neat stuff from time to time.
Here is what a shooter from the Philippines came up with recently.
