Dissapointed - GG&G Remington 870 Sling and Flashlight Mount Combo

Maybe it just didn't work with my shotgun, which is a 870 hardwood home defense. I installed it on my shotgun, and the cap for my magazine extension must not have been threaded on enough. I tightened it down as much as I could, but the thickness of the mount must have prevented it from seating correctly. Anyway I threw my Olight on one night and took it out on the river with me. I went to test it out and on my last shot I saw my flashlight fall into the water. It didn't take long to realize that it wasn't only my flashlight, it was the barrel, mag extension, and the mount with my $100 flashlight all went right to the bottom of the river. That one hurt a bit, a little over $300 worth of equipment is now gone because this mount prevented the cap from seating correctly. Like I said maybe just my model it wont work on, but if you are considering buying this mount double check that the cap is tight and seated properly.