Ugh. No help what-so-ever, but I should have expected that with Maryland laws and MSP guidance.
I'm considering a 6.5 Grendel upper. Of course, the one I'm looking states "Medium Barrel Contour".
So, a medium barrel contour, chambered in 6.5 grendel, on an ar-15 lower... Maybe I should call MSP to get a consensus of various answers...
If you call MSP twice on the same day, you'll get 3 different answers.