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by chiph 3566 days ago
This is partly because of the North Hollywood bank robbery, with the two men dressed head-to-toe in home-made body armor, where the 9 mm pistols and shotguns the police had were ineffective in stopping them. Some of the cops went to local gunshops to borrow some AR-15s that were able to penetrate the armor.

https://en.wikipedia.org/wiki/North_Hollywood_shootout

Afterwards, a lot of police departments started issuing Patrol Rifles (M-16s) to their officers (usually carried in the trunk of their cars) either purchased from firearm dealers/wholesalers, but also via the Department of Defense's 1033 program.

https://en.wikipedia.org/wiki/1033_program