what are your thoughts

[glock21]

ok so a few days ago i recieved a email from the armslist.com website about my ap9,
it was a 20yr old military guy asking if he could buy my gun if he was 20, i then ask you guys for advice on the matter and told him yes he could do a ftf but not ffl.
He then offers me 50 dollars more then im asking, im like sweet more money hahaha then i give him my number to text me when he gets back in to town.
he text me today saying he is the guy wanting to by my megastar and firestar, i tell him wrong guy i have the ap9, he says oh he got the emails mixed up but that he was just gona text me about my ap9.

ive seen the post on here for the firestar and mega star from su405, so i pm su405 and ask a question about it, turns out su405 is a little concerned aout the deal also,
why would a 20yr old want to buy 3 hand guns in 2 days and offer more then the owner is asking, maybe im putting to much thought into it but it seems weird,
when i ask if some one 21 and older can buy it from me to ease my concerns he says never mind.
what r your guys thoughts on it, or has anyone dealt with him and maybe hes just a collecter like most of us. thanks for reading.