Appears to be an basic 870 Express with camo, sights and a picatinny rail added. I expect the price is only going to go up.
Osage County Guns is showing one in stock $599
https://osagecountyguns.com/remington-81173.htmlI bought a standard 870 Express .410 to play around with hand-loaded buckshot loads. The Express's are a bit rough compared to a Wingmaster, but smooth up with use. It is a blast to shoot doves with when there are enough to be able to pick shots.