dun be so stupid lah, if so gd ask yourself why he want to sell?
Maybe it's "hot" and he's scared and wants to pass it to you so you
can own his problem. If the police ever raided your hse and found
these, since you are underaged your parents will get it for
sure.
why want to risk doing something illegal, just join the singapore
shooting association or singapore rifle club lah... get proper
weapons handling instructions , get a license and you can purchase
any gun your hearts desire.
there is also a shooting range where you can fire all sorts of
small calibre weapons from air soft pistols to air-rifles to real
handguns, rifles even shotguns.
http://www.singaporeshooting.org/shooting_courses.shtml