From your pictures it appears that your gun started life as an extractor gun in 1895 and was subsequently fitted with Moran & Wolfersperger automatic ejectors --
The pin in the forward part of the recess around the hinge pin ends and the slots milled in the front of the receiver are M&W work.
From the Remington repair code BJ3 (B = January, J = 1940, 3 = repair) it appears your gun was fitted with a set of new VH-Grade barrels and a new extractor forearm, and the M&W ejector parts removed from the receiver. Also the gun was fitted with the post 1910 bolt and the new barrels have the replaceable bolt plate.