A) the AR-15 is a semi-automatic rifle out of the box. B) "militarize a [gun] into a semi-automatic" - yeah, that's not a thing. C) "No need to hunt with a se

A) the AR-15 is a semi-automatic rifle out of the box. B) "militarize a [gun] into a semi-automatic" - yeah, that's not a thing. C) "No need to hunt with a semi-auto" - no, there are several subjective reasons one might prefer to use a semi-auto hunting, and several objective circumstances where it makes sense. Remember that semi-auto means one pull of the trigger = one round fired.