the onus is on you to follow the rules of the market, kijiji doesn't allow firearms for example.
the other thing to observe is that you are required to ensure that the buyer is of legal age to purchase whatever you are selling.
It's like putting an ad up for a car and a bunch of crackheads that you highly suspect will use the car in a heist or something turn up to check it out... if it seems sketch, don't deal with the buyer...aside from that, money talks.
I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.