After more research, decided to go with a Timney two stage for my MPX.  It’s made specifically for the MPX and has a bridge piece to protect the rear of the disconnector from being beat up similar to the factory trigger.  Got it last night and popped it in this morning.  Little annoying you have to remove the safety to remove the factory trigger, especially since the right side lever is attached with a roll pin instead of a set screw, but just a little more work and I had the right tools.

Trigger dropped right in and fit good in the receiver well.  4 lb total pull weight, without the grittiness of the factory trigger.  Definitely an improvement over factory and it looks robust enough.  This is my first drop in trigger and I’m wary about the hammer and trigger pins walking out since they aren’t locked with either a spring loaded pin or spring leg like the normal setup, but the Timney setup seems OK and the pins seem tight.  We’ll see how it goes in the long run.

Finally got to put some rounds down range yesterday with the Wilson trigger. Such an improvement over the factory trigger. Had no issues at all. Pins don't walk out and hammer took its beating like a champ. Glad I made the plunge. Maybe one day Geissele can get one out...

I appreciate your Wilson Combat trigger report. Been waiting for someone to give some real-time opinion. Still considering Wilson, Timney, and Elftmann for the MPX.

I tried dropping an MBT into my MCX and it does not work. I’ve been stuck with Sig’s two stage match trigger which is terrible comparatively.

I called Sig, they told me only their trigger would work.

Lots of back and forth on this board about the MCX and trigger problems with the Sig recalls.

FWIW @LaRue_Tactical

So @LaRue_Tactical what’s the official position on MBTs and MPXs? I have a G trigger in mine now because they told *ME* it was supported but now they are apparently telling folks it isn’t.

I’d like to know if I should swap...

I've got a thousand or more trouble free rounds through my legacy MCX with MBT.

I didn't do the recall.

I may be wrong but I thought Bill said in last weeks live stream that the trigger was ready for the MPX..  It just needed to be tested when they had time

MBT runs great in my MPX. Unfortunately does not work in my MCX due to Sig special sauce.

Well said, Larue. I still have less than 1k through mine . Pigs have not been cooperating lately. More field work needed.

Thanks Mark!  Honestly I'm fine if folks say their triggers are NOT compatible with the MPX, no shame in that - it was the G reversal and the mixed messaging that caused me to ask for an official response.  I've not been tracking round count through my MPX, so I truthfully don't know how many are on the G trigger now. I'm torn between the "run it until it breaks" mindset and "Swap to the one with a real warranty!"

Did you use the "G" Latch. My understanding is the MBT is a GTG with the Geissele "G" Marked Firing Pin Latch. If you call SIG CS they will send you one.

I called to get one last week, as I have an upper with the lock now (never sent in my legacy), and they wanted to charge me $49 for the "G" lock.