Proper crossbow bolts would probably be within the parameters; I'd like to try one some time. Its optimized for bamboo skewer with dressing. Actually, anything like that. I've made some real good ones out of knitting needles and pencils. It's powered with 3/8" bungee cord rather than the usual 1/4", strung through two pairs of pulleys.
They wouldn't let you carry one of those around out your way? My niece's boyfriend got the car that he was in pulled over because he had an earlier model with him. When the cop, the RCMP, saw it he just got sent on his way. That being said, I'm in the middle of a farming area in Atlantic Canada, and you're likely to see anything like that here. Watched a young feller come out of the woods riding a lawn mower one day.