I have the A.R.M.S. it's fine, holds it's zero. I'm getting rid of it though because I wanted the RRA dominator2 Eotech mount. I wanted to protect the rail on my upper, and I found I prefer the traditional A2 rear sight, over the flip-ups.
If you haven't read it, here's a ton of info on BUIS: http://www.ar15.com/forums/topic.html?b=3&f=18&t=206233
If you decide to go with the A.R.M.S. let me know I can make you a deal on mine.
If you haven't read it, here's a ton of info on BUIS: http://www.ar15.com/forums/topic.html?b=3&f=18&t=206233
If you decide to go with the A.R.M.S. let me know I can make you a deal on mine.