I'm looking to order a fiber optic replacement front bead, can anyone tell me what the proper thread size is for a front sight bead on the Browning BPS (12 gauge) shotgun? I was looking at one called the Extra Lum, by Marbles. Never heard of them, but they look interesting... have a peek, tell me whatcha think...

http://www.outdoorsuperstore.com/sto...TGUN+SIGHT.htm