Funny you should ask. I have a SIG MPX, just asked Hyperfire if any of their triggers would work.
Response was 'Yes the 24 series works great in the MPX". I'm tempted to try one.
I talked to Geiselle about a trigger for my MPX 9mm, they did not recommend the G2S. they sited possible reset issues with 9mm. They recommended the SSA or the SSA-E. I went with the SSA-E.