This is a Benelli 11707, but with a mil-spec barrel. It has a fixed, modified choke, using a current production M1014 barrel. These are rather hard to find, as one might imagine. It has the extra support in the receiver-tang and the "lip" of the 11707 barrel, but features the fixed military spec MOD choke, and is chrome lined.   The shotgun also features a custom mag-release, Carrier Comp Ti magazine tube (7 shot), and a Geissele "US" marked hammer, for 922R compliance, limb-saver recoil pad/