Does anyone have any thoughts on the strange mechanism behind the ejector "hammers" on the forend? It slides forward and back.

Additionally, I have never seen this before, but in the picture of the trigger/trigger guard, you can see a small square piece of metal protruding from under the trigger guard. When I apply the safety on and off, I can see it rotate slightly so I assume it is somehow related to the safety, but it seems so strange!