Multi-Stack Modular units ?

[softcock]

Question ? .. with the newer style of multi-stack modular units , ( No outside Tube body ) .. when 'Stacking' 6 - 7 - 8 or 9 Items/individual shoulder being screwed together .
You are hole boring each individual section/item concentric which is no biggie . But you are compounding plus+/minus- tolerance of each individual item being screwed/shouldered together . That is a lot of mating of individual shoulders to held in tolerance, from end to end .

Are the multi-axis mill machines that good these days ? . can they hold the tolerances that tight on all those mated shoulders your stacking ? .
Can individual/modular keep tight tolerance, like a stack design held inside a capped tube/body ? .
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[AMGtuned]

If we're talking F1 builds; there are cup/tube options that have extensions available. Personally, I'm not a fan of modular designs, but that doesn't matter.

The mod extensions would be male threaded on the proximal end, and female on the distal. Usually with a ledger, or stop, in the proximal so the guts don't fall out. This also makes it so the extension would only fit one tube/design/suppressor. Extra parts are usually not a good idea.

Not to say that there's not a lot of them being done.

Even though confident in my ability to make centered holes; I would steer away from thread together cups.

My opinion, take it for what you paid.