Flywtrjoe

I just bought a benelli rifled barrel for my M2 for pig hunting. It came with iron sights. Two questions: are the iron sights removable. They seem like they are glued or sodered on. And two: any suggestions/options for adding a red dot sight. I see Burris makes one that attaches between the stock and the receiver. I’m not keen to drill the receiver as it is thin aluminum and i also use this gun for upland game so the sight must be removable for use with my smooth bore barrel. Thanks in advance.