I just saw a documentary on the North HOllywood shooting, and they never mentioned any cops getting guns or ammo from civilian gun shops. They just showed the SWAT guys belatedly showing up on the scene. I’m not sure if the civlian gun shop story is an urban myth (false) or if the documentary whitewashed it out.
That’s on the Wiki page, for what little that’s worth, but I’d definitely heard it before. Your options (urban myth or whitewashed out) pretty well nail the likely truth.
Travis, I do agree with the advantages of .223 over carbines or shotguns, but many in LE have the unfortunate circumstance of shooting each other. There is an over penetration threat inside buildings (and police vests) and a lack of it for vehicles. I think department have to really consider their use in the field. Urban areas favors carbines while rural areas may require more range from a .223.
The North Hollywood Shootout indeed had cops scrambling to a local gun store to buy “assault weapons”.
I watched a documentary on it and they made a note of the police who went to a local gun store for higher powered weapsons. I believe it ended before they had a chance to use them.