This question has multiple answers.
The real question is what is your worst case - how many different barrels are you going to try and use this suppressor on. Which has the sloppyist threads, worst concentricity, shortest length of engagement, OAL of suppressor tube?
I once built a dedicated can for a customer that had a .236" blast baffle, M baffle stack was .242" and endcap was .249" and even using crap ammo this unit has never had an issue with any signs of a baffle strike. But again - its a dedicated unit and doesn't get used on any other firearm other than its intended host.
Regan said; Trust but verify. Well everyone should check the OEM barrel threads before any device gets mounted.
Don't try this at home, unless your home has $50,000 minimum in quality machine tools and you have 10+ years exp with those tools.