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I had one that I bought used at a gun show, and mounted it on a muzzleloader that I shot a fair bit. It held up well for a number of years, and accounted for several deer.
I then moved it onto a slug shotgun (H&R Ultra) and the reticle disappeared after four shots!
I paid so little for it that I figured that it didn't owe me anything, so I didn't pursue any repair options. I wonder, though....if I'd left well enough alone, I might still be using it.