Kahramon,
$1500 for an AK 47 in Singapore??? Dude, I live in S'pore and I can CLEARLY and CONVINCINGLY say that that figure does not even apply. Why? Because not everything is available for sale in our black market. What is available is as follows:
1)Drugs
2)Stolen goods
3)Pirated music, movies and software
Bonafide automatic rifles or even any type of unregistered longarms DO NOT even figure in our domestic black market. In other words, even if you are prepared to pay serious $$$ for a stolen Cambodian AK-47, NONE are available for sale. The best that any shady character can possibly buy is a handgun (you don't get to choose what type) that was smuggled in during the 70s and 80s when border controls were lax. Expect prices to be steep - perhaps 2 or 3X legal stateside prices for a beat-up revolver. Ammo would be about $1/round and don't expect to get more than a dozen rounds.
Singapore is an island about the size of Washington DC. All entry points in and out are tightly controlled and screened. Since 9/11, ALL baggage and cargo is X-rayed so virtually NO GUNS get in or out unless the .gov gives approval in writing.
Lastly, hefty fines and VERY LENGTHY imprisonments (flogging by cane might be included) is guaranteed for anyone trafficking or possesing illegal guns in any way shape or form. Hence, local criminals conduct their business with knives, machetes or other melee weapons. Guns are simply not worth the penalities.
Besides, even if you do successfully purchase an illegal AK-47 or M-16 which was smuggled in during the Vietnam war and managed to acquire some ammo for it, WHERE are you going to shoot it for practice? Discharging the firearm will bring about IMMEDIATE swat team attention and the ammo will most probably have been stored in damp or inappropriate conditions for the last 30+ years so reliability will be questionable.