XM21 & AN/PAS4 action detail
A closer view of the scope mounted to the rifle, these IR (active) scopes were used early, although at least one was issued as late as 1971! They were fairly effective but the "active" IR emitter could be easily detected w/simple countermeasures, the Soviet SVD Dragunov rifle had a built in IR detector in it's standard day time optic!, these scopes were mostly replaced in the field (as weapons sights)by the AN/PVS series starlight scopes (passive NV) by 67-68.
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