I’ve never understood the need for a modular suppressor. Most people want the greatest db reduction possible while still being practical. There is a point of diminishing returns. As stated, once you have one, you’ll want more. A 30 cal can is going to suppress 308 better than a 45cal can will even if it’s rated for 30cal. Same for the .223. I can put my 9mm can on my 22lr, but it wasn’t designed to get the maximum suppression. This, of course, is just my opinion