Originally Posted By: Argo44
There is an interesting sidelock 12ga SxS Reilly shotgun that just appeared on Guntrader.uk...(which references this website) SN 32658:
https://www.guntrader.uk/guns/shotguns/r...200227180805801
"There is a web site dedicated to E.M.Reilly guns and I have managed to find out this gun was made in 1895."

Why the screws on the fences?

The screws retain a cover plate under which the forward extension of the toplever which forms the top bolt sits.Just seen the same setup on another (boxlock) gun.



For more see this line:
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=566282#Post566282