There were lots of "civil disturbances" by students protesting the Viet Nam war to be sure. But there were a fair number of urban riots with active shooters firing on police/National Guard types that had nothing directly to do with protesting the war.
Now as to whether or not the K4 equipped guns were assembled to deal with any of those or were assembled to augment declining stocks of other scopes, I have no idea.
Now as to whether or not the K4 equipped guns were assembled to deal with any of those or were assembled to augment declining stocks of other scopes, I have no idea.

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