For the guys that might be considering one for their scope. To install, you just pry open the mount ring enough to get it slipped over the scope tube. I could find no instructions, so I finally pryed the plastice mount ring hoop apart until it slipped over my scope tube.
I had to shave off fat spots on mine to get the plastic mount to fit between my scope rail and scope tube for installation. No way was I gonna pull my scope off my receiver to mount this thing.
Here's something to consider. I backpack hunt. I can't have this magnifier lens sticking up above the scope tube to the extent it does if permanently mounted in place. Just gonna get in the way. So it needs to be rotated out of the way for my use. I purchased their 30mm scope tube sized mount. Then I installed some 2-sided tape to my 1" scope tube, and left the plastic coating on the one side. Mounted the 30mm-sized hoop around my 1" tube and then positioned it over the spacer tape, so I can rotate the magnifying lens off to either side while packing my rifle around. Then if I need the magnifier to see my turret markings, I'll rotate it up and into place so I can see, and properly adjust my elevation turret.
The mount could definitely be improved so a guy doesn't have to take a grinder and Exacto blade to get it installed onto a mounted scope, without having to remove the scope from the ring mounts. That's annoying. After I've sighted in my rifle, no way am I gonna pull the scope in order to install this magnifier, and then refasten the scope to my rail. So between a metal cutting blade on my 4 1/2" grinder, and an Exacto razer blade, I got this sucker to slide between my integral BAT action rail, and my 1" scope tube. It doesn't make a guy feel great to have to grind and cut on a new product in order to mount it on the scope tube, with the scope attached to the action.
My 2 cents...