Well I got the rifle for Christmas from the wife and still have not got an optic for it. I have been looking at NF NXS 5.5-22x 56mm with the zero stop or the Leupold Mark 4 ERT 6.5-22x 50mm. I know the NF alone with the zero stop puts it ahead of the Leupold. I have had the pleasure of looking through the NF but not the Leupold. SO with both scopes having lifetime warranties what is the comparison between the two if you can even compare them. Thanks for any help of info.