Vortex Diamondback 4-12x40mm Riflescope

I decided to give this Vortex a try, as I usually stick to EO or PA.. the glass on this is super clear, a very wide range of view, and crisp reticle. The size is great for the M4. Seems like it would be a good scope except the windage does not function. I could not get it to move, maybe I got a bad unit, but for my first try with vortex and being used to higher end optics, left a bad taste in my mouth, gotta return this now and go with the trusted brands. For a budget optic, it seems like it would be great, just make sure your unit is g2g. Maybe buy from the store so you can check all knobs and such.