Take a look at the Mossberg 500 Turkey Tactical...https://www.mossberg.com/product/500-turkey-53265/
12 ga, 20" barrel, 3" chamber, adjustable stock, FO sights. MSRP is $643, but I see them on GB for $439 with free shipping...https://www.gunbroker.com/item/852496598
I bought a new Mossberg...