I'll tell you that most Central Texas, metro area, police have got carbines. And State polices have all got AR's and 870's, or 590A1's, in the same vehicle. And not to long ago every so many State officers carried bolt or pump action scoped Remington 30-06 rifles, for 'marksman' use, lots were leftovers from decades gone bye.
Lots of gear, but I've never met a LEO I thought was a decent shot. Most only shoot when they have to qualify. I put more rounds down range in an hour than they would all year.