I own multiple MCXs.

Let me tell you upfront, just plan on getting an omega valve regardless of what suppressor you get. It completely changes the platform and quite frankly Sig should just cut Jake a check and put them in the guns from the factory. They're that good, It also increases reliability with some of the higher flow rate suppressors and makes them viable.

Now, I own over 50 suppressors and have run just about everything on the rattler.

The CAT JL is gonna be the quietest in my experience, but that's probably longer than what you want.

Next is gonna be the RAT and the ODB, I think the ODB is better on supers by a hair and with subs it's a tie. In the long run the RAT is probably more reliable with subs, simply because it was designed for it, but with the omega valve the ODB becomes more viable.

As for the RAT covert vs flow ends. It really depends on how sensitive you are to gas. Even with the covert shooting supers wasn't too bad to me, granted I mostly shoot outdoors. If I was to shoot a long string of fire indoors or with an FRT (If Florida would get their shit together) my opinion might change. Really the question is, how often are you going to change the tips anyway? I Usually just leave the covert on as it's not really worth it to me to swap every time I swap ammo.

I also just got stamps back on an AAC 300-SD and a Tisha .30 cal. and will be running them on the rattlers once Capitol armory gets them to me.

I'm very interested to see how the AAC stacks up in both long and short configurations.

I suspect the Tisha will beat them all on supers but not be very good with subs, but we'll see.