I do not believe that a fixed magazine rifle can be a assault weapon in any configuration, however, it cannot run afoul of the large capacity ban:
“large capacity feeding device” is defined as: “(i) a fixed or detachable magazine, box, drum, feed strip or similar device capable of accepting, or that can be readily converted to accept, more than ten rounds of ammunition..."
Before Jack chimes in, there are over 7K threads on this already. Using the search function is easy and intuitive. If you still can’t do that, them there’s this:
UNDERSTANDING “ASSAULT WEAPONS” AND “LARGE CAPACITY WEAPONS” A guideline for Massachusetts Caution: this information is intended as a guide only and should not […]