An update on the Axcel slider. You can not leave the elevation lever unlocked with this sight, it will move up and down a lot. I'm not really impressed with that and not sure if it is just mine or how this sight works. With my CBE it didn't move unless you turned the knob, ever.
I emailed Axcel about it and they never contacted me back.
Neither of mine move when the tension is at the lowest level.