first one- some kid at sports store in grand rapids mn, i asked about an AR and said i was building one and he goes "are you gonna put a tele stock on it?" and i said "wish i could" and he was telling me i should just build it however i want, etc...wtf?  

2nd at a gun show-i was looking at a 9mm AR and he says "put in a ____(some kind of trigger" and make it full auto"  

it's all common knoweldge and i can understand people talking like this at home but while they are selling i think it's pretty bad advice..both parties could probably get into trouble.

You should just introduce yourself as Inspector Richard Cranium of the BATF next time.