I have that all wrapped up. 17 and 18 year old sons handle low level threats. For long distance I have an M21 Optics. Intermediate distance M1A NM Iron Sights. Closer "Urban" distances SOCOM 16 (supposedly Christmas). Remington 870. In your face distances any number of .45ACP's. Mostly one of John Browning's finest creations.

If the young man is lucky it will be very quick. I really don't like getting my hands sore.
Did I mention I am rather fond of the M14 series of rifles? Looks like the M21 may be sold to a deserving LEO in Oklahoma though.