Expensive, but works great in gen 2 sig sauer mpx - Geissele Super Semi-Automatic Enhanced Trigger

Sig Sauer was claiming installing an aftermarket trigger without the trigger bridge would void the pistol's warranty. They have now withdrawn that claim saying it won't void warranty, but the aftermarket trigger could be damaged from the high velocity blowback of the bolt carrier. Bill Geissele claimed on a forum that this trigger works with the MPX and their warranty would stand behind using it in an MPX. I installed and tested about 80 rounds through it so far, and it is working very reliably with no issues yet. The original trigger was 9.5lbs pull weight, very gritty, and the worst trigger of any of my many guns. The SSA-E working in the MPX was a huge relief with a smooth trigger pull, 4lb weight, and crisp break.

I have read reviews of other brands of triggers that are adjustable having issues with the MPX. The claims are the lock tight for the set screws gives due to the aggressive blowback of the MPX and causes malfunctions due to adjustments being compromised.

I highly reccomended this SSA-E for an MPX.