How often or after how many rounds do you pull the barrel off & remove the piston and tappet cor cleaning?

Following. Curious on when to do this.

I can't tell you and as far as I can see Sig doesn't seem to say in the manual. But I've been running my MPX in near weekly matches since I got it and waiting to see what actually causes it to degrade or stop running. I have not touched those parts just under 5K rounds. This post may make me take it apart and see how messy it really is.
I have kept the bolt, carrier, op rod and all those reciprocating parts cleaned and well lubricated about every 1K rounds or so, and generally give a small squirt on the bolt etc. if I think its looking dry before a match. SO far the gun has been completely reliable.

I use shit tula, wolf, brownbear ammo in my mpx. I clean it about every 500 to 750 rounds.

When i first got it, i would have issues every 100 rounds or so for the first 1k. Since then, the mags have relaxed, the whole gun has been broken in. It now just ticks along.

Just to note this, I have been running this gun indoors (winter up here) and since I had a lead scare a few years ago my MPX has only run lead free ammo. That ammo in my experience is exceptionally clean especially compared to the stuff DSgrouse is using.

Some recommendation from SIG would be nice. More out of curiosity than for any functional issues, I pulled the gas value & tappet out at about 500 rounds. Most of that was Federal Am Eagle 115g & some home brew using CFE Pistol. It was tough to get the gas valve out but a little lube fixed that. Keeping the parts wet with MPro-7 for about 15 minutes loosened most of the baked-on residue. There is no indication these parts should be lubed so I but it back together dry. Based on this one experience I think I'll make this scheduled maintenance after every 1k or so (I am not using a suppressor), but from hrcjon's comments it clearly can go a lot longer.

We have a week off between the indoor and outdoor seasons so I plan to pull mine apart this week. I'll post what I find. I bet it will be dirty based on the above.
j

My pistol has a good 3k of brown bear through it (binary trigger) and I've not even looked at the piston.

Ugh, might be a bit of a mess.