Read the instructions - XS Sight Systems XTI DXW Standard and Big Dot Tritium Rifle Sights

Those who are complaining about how low the sights are more likely than not, have the sights mounted incorrectly on their rifle. These are to be mounted at the same distance from one another as they are on your pistol, 6 inches or so, AND they should be mounted on your rail at the same distance from your face as the sights would be if they were out in front of you on a pistol. If you can conceptually see what I am saying here, you’ll love these sights.