This has been covered a hundred times, even in the short time that I've been here, but (in my humble opinion) once you've had / used the real Magpul full version of these (not PTS, not knockoff), you'll know that they can be a precise sighting mechanism. The GEN2 version does sit lower, fold down tighter to the rail, and work better than any of the other versions mentioned above. And with all due respect, isn't Amazon just a glorified Ebay when it comes to stuff like this? If the seller selling through Amazon is a no-name company, who really knows if you're getting the sight you think you are? Buy them from a well-known Authorized Magpul dealer. God knows there are plenty of them. If you don't pay the full $$, you're just not getting the real version. There is a reason they cost more. For those of you using this with no other optic / red dot, this is the one part of your rifle that determines where your bullet goes. This is not an accessory...I say buy the good ones and don't look back.