Thanks for all the replies, alot of good input!
I have another project for this gun as well. I´ve got the 20" slug pipe with rifle sights and I´ve bought all the Benelli spare parts for the original ghost sights. The original tactical barrel is only 18.5" which is too short to be legal in Sweden.
I want to replace the rifle sights with the ghost ring sights parts. Has anyone done anything like that? How is the rifle sights attached to the barrel?