AR15 is a lighter, lower powered gun than your typical hunting rifle; the energy of a .223 bullet is a lot lower than a .30. The capacity is almost irrelevant, changing multiple mags is no problem for anyone with decent training. I am the kind of guy that loads only 5 rounds in each 10 round mag (sport shooting), so changing mags is as natural as firing the next round. People telling that "high-capacity overpowered mass destruction weapons" should be forbidden, on the other side...