[Oregon.gun.nut]

I have a Springfield/J. Stevens Model 311/530 SxS 20 gauge with a 5100 frame probably mader between 1940-48. I received this in a trade and it is in very good shape except fotr the sights. As showen in the attached photos, the rear bead is broken off flush with the rib and the front sight appears to be a slotted screw with its slot filled and I'm not sure if it has been epoxied or glued in place by its appearance.
I intend to sell this gun and would like to restore the original sights if it nmakes economic sense. The gun shoots just fine as is. but I have replacement #6. .130", 3x56 threaded beads just begging to be installed.
I am not a gunsmith, but I would like to know what to expect that a good gunsmith would do to remove the sights and install new ones.

(Sorry---I'm trying to figure out how to reduce my image size so it can be posted)