Ok so I just found out that I need a front and rear sight on my shotgun for work instead of the bead front sight. Now I'm hoping to cut costs down with a front sight that just screws into the hold the bead is in rather than have to pay a gunsmith to solder on a front sight, but most front sights that screw in are just to replace the bead and not tall enough to be used with a rear sight. As for the rear sight is there something that can be screwed on where the top rail would go?