Ordered several other items days before ordering my Meprolight M21, but got my M21 first in the mail. Couldn't be more happy
This sight is awesome and very accurate out of the box. I wouldn't expect any less from a battle proven sight like this.
Sight hard ware and everything is top notch. Optics are awesome and comes pre sighted in. Only issue I'm having is the reticle. The description is "open x" but the reticle is an x. There also is issues with attaching a washout remover with this reticle. Two separate x reticle appear when the remover is turned on. I have not heard this problem occurring with any other reticle. Would not recommend the x if you wish to attach one on your sight. Other than that issue, the sight is great.