pig4bill

The factory 110 Tactical and Desert Tactical take AICS and might work. Maybe you can find a take-off or trade for your chassis.

What does Max use?

Foxtrot Mike also has a youtube testing their upper with various lowers.

The SIG minimalist stock?

TriggerTech has an MPX-specific 2 stage.

I have one, and the thing that hooked me was the "feel" of the action. I wasn't looking for a rifle that expensive, but after playing with it, I knew I would always want to get one. Recoil lug, I don't care. None of the custom actions is going to have a recoil lug that isn't rigid or "strong" enough. The Pic rail on top, the advantage/disadvantage of integral is obvious. It won't come off. If you have one, no worries that it will loosen. Also no ability to change it if you want one with a different angle. Mauser claw extractor? They can be wobbly and not as smooth as a round bolt, just not a fan. BTW, Terminus was started by the Curtis action designer, so Terminus and Curtis have a lot of similarities. The Tikka option is worth exploring. West Desert Shooter on youtube went through a lot of variations with his. It's quite a long range blaster now. They are also very smooth, though not as much as the Curtis, and have a 70 degree bolt throw iirc. Lots of stock options are available, a chassis or GRS Berserk or Bifrost.

Doug Koenig, factory Ruger shooter, uses one.

For a 9mm consider the Ruger Charger.

FWIW Blackout subsonic punches IIIa armor with ease.

There is also a new Trigger Tech cassette-type that's MPX-specific. Or the KE Arms with a linked disconnector that sits below the trigger so the hammer can't hit it.

This sounds right. I have one from a couple years ago. Older Glock mags fit well and drop free, but new ones that fit ambi Glocks are a tight fit. To the point that I got Magpuls to use in matches instead. I also got a newer lower (so I could build a pistol) and all the mags I have drop free.

There are youtubes on how to burn them out but it's slow. It involves drilling deep holes, flammables, and usually a full day or two until they turn to ash. You sort of have to keep watch so the fires don't get out of hand.

For reals? I have a bag full of receivers somewhere.

You could only buy one lifetime back then.

That's because there's a lot of crap out there put together by clueless people.