I took my Maverick 88 out to shoot some Aguila mini slugs last week. The temperature was somewhere between 5 and 15 degree that morning. 31 rounds in and I hear a weird pop and ting. I emptied the mag and began inspecting her. I checked the bore thinking maybe the cold somehow led to a squib round or something. Finding nothing in the bore I checked the trigger function and the forend. Everything looked good and functioned as it should, so I loaded her up and raised her to my shoulder. It was then that I noticed my front bead was missing. I figured that between the temperature outside, the different temperatures of the steel barrel and brass bead, and the pressure generated by the slugs the bead had backed itself out. The pop was the bead leaving the barrel and the ting was it hitting the roof at the outdoor range. When I called Mossberg they confirmed my theory, sent me a new bead free of charge, and recommended a bit of loctite on the threads. That day I finally realized/learned that loctite wasn't just applied to various parts of firearms for no reason.