Don't waste your time. - Primary Arms SLx MD-21 Push Button 1x21mm Micro Reflex Red Dot Sight w/AutoLive

I had high hopes for this optic, but the "you tubers" were right about the emitter being a problem and causing a massive halo effect if you turn up the dot… and not even all the way. I clicked it 3 times and got this massive red bloom inside the optic.
For the money, just go buy a Romeo 5 Gen 2.