Why is AR-15 prefered more than PCC for home defense?
I often see the overpenetration argument as the main one. 7 yards is a pretty realistic distance for most home defense scenarios and I don't fully get why AR-15s in 5.56 get recommended so much for this. It's a fast, light round, and at that range it probably hasn't gone far enough to yaw and fragment like it's supposed to, so the whole "5.56 overpenetrates less than 9mm" thing might not even apply indoors.
A 9mm PCC seems like it'd make more sense here tbh. Lighter gun, less loud, less recoil, cheaper ammo to actually practice with.
What am I missing? Is it stopping power, familiarity with the platform or something else?