This has happened before when cops were outgunned by 20s era mobsters and had to upgrade their weaponry to keep up if not ahead. Nothing new here.
"A growing number of police departments across the country are taking steps to make sure that their officers are not outgunned on the streets. Many large agencies, including the Illinois State Police and Missouri Highway Patrol, as well as local police departments are upping the firepower carried by officers on patrol."
Many Police Departments Increasing Firepower for Officers So That They Aren
Now many of the articles are from "anti 2nd amendment" sources, but that doesn't change the fact that large city after large city, police are routinely out gunned.