There is 99.9% Nodak lower will be classified or reclassified as prohibited then. Toxic item.
One of the tests that has been used in classification is the ability to accept the upper. Innability to accept the upper made 180B NR, same goes to "modern hunter". Simply put, looks like 180, takes 180 upper, it is 180 or variant of it. Whether the upper "regulated" or not, it does not matter.