I could probably mount a set of shadow thins on one of my shadows and put the compact upper on it, to make a true gamer gun. I removed the FPB from my compact upper and technically of course that makes it a non legal IDPA gun, although nobody at my club would check.
Or, I could try to find a shadowline compact, which comes with factory ambis and no FPB, and put shadow thins on it. However, they are all gone; I almost bought one but they seemed pretty expensive for what you got and I passed. In addition, I already had my fully worked over compact.