One of the members at the Saiga-12 forum is a LEA armorer, he and several other of the officers have Saiga 12 and Saiga .223 long arms in their inventory.
The Saiga 12 is a Kalashnikov 12 gauge while the Saiga .223 is a .223 Kalashnikov.
Did you know there are legally converted full auto 12-ga saiga shotguns?
You can find videos of them on youtube.