@devinplombier -- Sorry about your child. I hope they are ok. As for pulling in my situation, I was smart enough to know the odds, and 3 vs 1 was not in my favor -- especially with the angles I faced (back to a car and 1 on each side and tbe third in front of me). My cooler head prevailed and ended up winning.
I referenced my encounter because that was out in the open in a parking lot. If people trying to get into gangs will do that, pulling a piece on you inside your house or garage is a cakewalk. Unfortunately, if criminals are not going to face the punishment they deserve or be given No Bonds after arrest, one must be very cautious when selling expensive gear out of their house. Today’s criminals can easily determine if you are selling an amp that retailed for $20,000 or more, chances are you have other valuable items in your home.
Best wishes for your kid, and safe selling.

