Get what you pay for. - Vortex VMX-3T Magnifier with Flip Mount

The magnifier is alright but eye relief is very very tight. It would be fine on a 5.56 but you're playing with fire if you run it on anything else. The dot through the magnifier is not crisp. Depending on how you adjust it, the dot can be turned into either a vertical line or horizontal line. Besides that the image is fairly decent. My biggest problem is with the mount. I could forgive the short comings of the optic alone but the mount is absolutely garbage. It's heavy, in the way and unergonomic. You already have to sacrifice your rear iron because of the short eye relief and with this mount, you better hope you never need to charge your weapon in a hurry because this thing is always in the way of everything. The magnifier I might might recommend but this mount is total garbage. I'm very disappointed.