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That was the case with mine, up until is tarted ####ting the bed every now and then. Yes I got a new one for free, but I was out of an optic for a while and it didn't work when I needed it. I will never trust a SPARC anymore.
Aimpoint H1 (T1 if you like to spend extra money with no reason) is the only RDS I trust with my life, those and Trijicon's new offerings.