Howdy,
Just sharing a recent acquisition. I picked up a neat Model 12 Riot stamped "Washington State Patrol". It's in good shape with normal wear, scuff marks and dings from being carried in a car. The serial number puts the manufacturing date in 1959. Still has a legible rack number on the stock.
The interior of the receiver was extremely dirty and the bolt was gummed up with small pieces of wood, dirt, old grease and oil that was a sticky, hardened mess. The action was rough and stiff until I did a complete tear down and deep clean.
After cleaning and shooting a few boxes of cowboy loads, it is smooth, like a model 12 should be. It won't be my primary Wild Bunch shotgun, but I will use it in matches/stages occasionally and shoot it for fun. I will use it, not abuse it.
Based on my research, the Riot shotguns for Washington State Patrol were factory stamped on the left side of the receiver. They were replaced by the Remington 870 police model starting in the 80's. The 870's were phased in as officers retired and the last model 12 was taken out of service in the early 90's.
Anybody out there know anything more about these riot shotguns?