I'm a big fan of Eotechs, but I am disappointed in my 516...going to have to call Eotech tomorrow and send it back for repair. Apparently the diffraction grating is starting to delaminate; I have a dead stripe in the right third of the window in which the reticle disappears. At first I thought it was just my glasses or head positioning, but now it's gotten to the point where it's pretty noticeable. Anyone had any experience with Eotech customer service? Fingers crossed!