labradankThis is a spacer to use in tandem with any ACOG mount and ACOG pattern scopes. It raises the scope slightly so you can mount a back up rear iron sight underneath the prism optic. It also extends the prism scope backwards so you could have an easier time dealing with some of the ACOG models with shorter eye-relief. I wound up not needing it as I have an ADM mount for my TA31.
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