Put another way, if your delinquent roommate who had a part time job at Wendy's suddenly amassed a sizeable armory and the ammo/gear to haul it around, wouldn't you get just a little suspicious he was up to no good? I mean, your best friend in high school, and if he isn't starting a gun club, or a Youtube channel testing weapons, you are probably talking to law enforcement about the pile of 70 magazines and expensive 'scary black rifles'.