Brandon Smith at Alt-market.us, gives a good outline of why it is the Left who are afraid of the black rifle, the AR 15. Most gun deaths are by pistols in the US, not rifles at all. The Left fear the AR 15, and other semi auto rifles as conservatives have them, which makes a bit of a problem for communist patterns of genocide. Much easier to polish off conservatives who have no guns!
https://alt-market.us/the-real-reasons-why-california-leftists-are-terrified-of-the-ar-15/