The Vortex also came with a nicely designed mount that I used on my AR15 but I mounted it in reverse mode so that the scope swings out to the right and out of my left eye vision. Some people complained about the mounting hardware being loose and wobbly and that the way I mounted it was difficult to use. I had none of those problems, the mount is solid and well designed and flipping the scope to the right is simple and easy. I do it one handed and I show it in my video. I mounted it this way so my left eye vision field is clear and it works perfectly in this mode.
I used the shim plate that comes with the scope and it worked perfectly. At the range I was shooting 5 shot patterns in the bull's eye with a spread of ¾ of an inch while standing up. The scope does have elevation and windage adjustments on it. It has nothing to do with the accuracy of the scope as the red dot is the accuracy setting. All you are doing is setting the red dot in the center of the scope and making sure that your field of vision down range is centered around the red dot. I used an Aimpoint Pro red dot scope that I own.
There is a nut used to tighten the scope onto your rail and the nut is slotted. Do yourself a favor and tighten it by hand and then get a good wrench or socket and tighten it down. Don't use a screw driver and scratch up the mount. Don't crush your rail, but make it tight. After 200 rounds then check it and tighten it again because it can loosen on you from vibration.
In my shooting I found that I had a 3 inch+ eye relief that worked well for an AR15. My success at the range was excellent and I had a great time. On the back of the scope is an adjustment to tune the optics to match your vision and that helps to make the target crystal clear and in focus.
This is an excellent sight and I recommend it as I rate it at 5 stars. My only complaint with the scope is that it doesn't come with lens caps. I went out and purchased a Butler Creek Size 01 flip up lens cap and it fit perfectly. I cannot believe that Vortex makes lens caps and simply does not include them with the scope when you purchase it. Vortex, raise the price $20 and include the flip up lens caps.