Newbie with forearm issue

[Alleghany]

New member and proud new owner of a Parker Reproduction DHE, 20 gauge, SST, choked M/IC, splinter forearm. Beautiful gun.

Not sure what i did when I took it off but cannot get the forearm back on the gun when assembled. I can get it on with the barrels off the receiver but the ejectors stay open.

I'm fairly certain the issue is the rounded steel pieces protruding from the forearm that seem they should be inside the forearm but are not right now. They do not move with finger pressure at all and I can't find any diagrams of an 'exploded' forearm to see what it looks like on the inside. It seems these pieces should be flush and work in conjunction with the ejectors when the gun is assembled. But like I said, I'm new and am not sure how I got to this point.

Any suggestions or advice is appreciated.