Quoted: I know that Cav arms quit selling them.
How good are they?
how about this one?
Link to Ebay
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Not sure if you are aware but the sight in the link is not an OKO.
Also, in case you're wondering, Cav stopped importing them because the Chechs are somewhat difficult to deal with in terms of money. There are not a lot on the market right now because the guy who is now handling the importation is having the same problems. I think STI is importing the pistol sights but I'm not certain.
As far as how well they work, I've had an OKO-M on my M16 for more than 5K rounds and the only time the dot moves is when I'm moving it. Admittedly I'm biased as I have a few I'm selling (in the EE) but they really are decent sights for the money. Cav has put OKO sights through much punishment and they have proved to last. I would trust an OKO, I would not, however, trust the sight you posted the link to.
Again, I'm biased so take it for what it's worth.