Purchased a Vortex Sparc for my 15-22 on Black Friday to replace an Aimpoint I wanted to use on one of my 5.56 ARs. When I received the Sparc, the high rise mount had an "oblong" cut shape where the surface meets the bottom of the optic, so it wouldn't allow the optic to sit flush on the mount. After an email over the weekend and a follow up Monday morning, Vortex sent out the correct mount as replacement and it's already in my hands. They simply requested I return the incorrect mount in a prepaid envelope they included. I just wanted to say thanks for the fast service and provide them with some positive feedback for the forum. Thanks again!