Once on stays in place. Target acquisition is fast and easy. I mostly just aligned the circle from from rear and front sights( poor lighting) And could cover a quarter at 25 yarfds.

I always use fixed sights on my SBR's when running a CQ optic, which for me is are EOTechs. Initially, I used Daniel Defense fixed sights because they were readily available and well, more common place. Then I ran into Precision Reflex or PRI because I just wasn't feeling the DD sights. Sure they are standard M4 style, which I was already used to as a soldier, but I wanted to try something different. I ordered a set of their fixed sights for my 10.3 and I haven't looked back since. Particularly their front sight. The rear sight is fine, easy to adjust, but the front sight is what trips my trigger. I like it because it fits right around the 65 MOA ring of my EOTech. I like absolute witness, so whether I'm using my optic, or switching to irons, it seems one in the same to me. Also, when I use the irons alone, I find that my acquisition is a little faster. There's just something about that circular front sight that my eye really makes a fast acquisition with. Maybe because our eyes are round or our pupils are round. I read some kind of study on that, but it was pertaining to HK style sights, but these PRI are a step better. I know because I've used Troy's HK style sight, and again my eye is quicker to acquire with this PRI front sight. The perfect combination for me, is to put LaRue's fixed rear sight and this PRI front sight together. They actually sell that as a pair, although I didn't get my that exact way - I can tell you that is is flat out a winner winner chicken dinner. Add to that my EOTech, which no one loves anymore except me and Steve, and I have a sight setup that is just fast. Fast, fast, fast and faster the more I train. The quality is outstanding in typical PRI style. I think the fact that Mr. LaRue sells PRI sights is all the validation they need. He wouldn't sell them if they were not completely legit.