[cidrasm]

I don’t see a magazine in the rifle, I see what appears to be a hand grip on the stock. I also see the LEO is working the action from the right side of the receiver. That would be inconsistent with an AR-15 style rifle which has it’s charging handle on the top rear of the upper receiver and would be worked by pulling to the rear over top of the buttstock, not from the front of the receiver.

So, that could be a semi-auto shotgun (like a Saiga with an AK style receiver) or any other numerous semi-auto shotguns with a pistol grip buttstock added.

[Carriage Hill]

BINGO! Sort of looks like my Remy 1187 Autoloader...

http://www.remington.com/products/firearms/tactical/shotguns/versa-max-tactical.aspx

Also have this 870 Tactical...

http://www.remington.com/products/firearms/tactical/shotguns/model-870-express-tactical-blackhawk.aspx

[DoughtyOne]

Thanks for the comment. I appreciate your take on the clearing mechanism.