Not a bad idea, I cant use a slingshot in the city limits, but I can carry a whip and open carry a bowie knife.I'll have to check our laws regarding whips...Pennsylvania has some odd laws on some weapons!
I also make and use the david sling, I can throw a 3 ounce stone around a 150 yards. Kinetic energy is about a medium pistol round. 3ounce rock @100 mph. (lead sinkers are even better) You have to be dedicated to practice to get accurate with one. I have been practicing for 5 years and can hit beer cans @100ft. Never twice in a row but about 75% of throws at that range would make a man size target very nervous. I don't use the multiple rotatin depicted in the video. I make 1 3 quarter rotation.