I don't know about the speed bead on other models, but on a Remington 870 the recoil of the gun physically would bend the mount from shot to shot, changing your point of impact. on a 870, the part that went between the stock and receiver was a very thin wire like piece of metal that you could bend with your fingers, it actually flexed from shot to shot. Hopefully its designed better on other models. Also, I did not have enough elevation adjustment to even follow the directions and adjust the red dot down to the top of the bead on the end of the barrel. burris actually made a shim kit to fix this problem, however it took enough shimming to make the purpose of the speed bead useless. needless to say, I went with a 336 mount and and got my receiver drilled and tapped by a gunsmith. This was years ago before sumtoy started making mounts. Probably doesn't help you, but id stay away from a speed bead. Just my opinion.
