The problem with using them in CAS with NCOWS is at least the early ones we looked at did not have the correct lever stroke to the originals and since short strokes arent allowed in our rules we couldn't allow them. Otherwise how do you draw the line on short strokes?
That said I looked at a couple at the NRA show in the Winchester display that didn't seem to have an obviously shorter stroke so I'm wanting to do a little more research to find out what the deal is on that.
I had looked at one at my local dealer when they first came out and compared it to a uberti and original winchester and found the Miroku had a shorter stroke, something on the order of the first gen short strokes.
They are nicely made rifles for sure, the firing pin is an ugly mess with the safety stuff but I understand that can be replaced.
I'm still considering buying one even if I don't use it for CAS it would be fun to play with. Every Miroku rifle I've owned has been great, I hunt with a Browning A-Bolt.