I'm considering buying a SXP Longbeard and looked at them at my LGS. I did not like the clamp on sight that comes with it. I would prefer a fiber optic bead, I have Truglo Long Beads on a number of shotguns. The SXP Longbeard has a metal bead mounted behind the front clamp sight, is this bead threaded and can be removed? I figured the SXP longbeard owners out there would know.