This gun has some type of after-market ejectors. They don't look like C.A. Fisher or Moran & Wolfersberger ejectors that I've seen before. Coming out of the Dakotas Fisher is certainly a suspect though. The forearm Iron appears to be the #2 forearm from 95xx0?
Some time back, someone posted pictures of a 20-gauge CH(E) two-barrel set. The ejectors on the #2 set of barrels look similar to this gun --
91964 02 20-gauge CH(E) after market ejectors number 2 barrels.jpg