I checked out the newer Vortex Spitfire prism 3x and 1x sights, they seem pretty solid and well built. I bring this up only because I have a pretty bad stigmatism now(or w/e it's called). It makes looking through a RDS or holographic site like the Eotech a nightmare. Even with my up custom sunglasses w/ a prism I can get issues. Only time these sights clean up are when I use a 3x mag behind it. Well,I finally got to look through the Spitfire Prism and it had the clearest/Sharp reticle I've seen. So if you guys have a hard time with blurry eotech's or star bursting RDS's you may want to look into some Prism sights. I know the Spitfires are designed for AR's but I can't imagine it being a problem with a 5.56 weapon with a 16-18" barrel. Just some food for thought.