you will need to find out if the store is still in business or contact the police if he registered it.
Have it examined by a gunsmith
If you're in the U.S. the short answer is, you can't.
use a gun or very sharp object
www.airsoftatlanta.com that is where i bought all of my airsoft gun stuff at
Check w/ your local law enforcement.
Blue Book of Gun Values
Long gun.
Depends on where you bought the gun. If from a store they should have the info. It might even be on your receipt. If you bought at pawn shop they usually include that info on the receipt. If you bought from individual and your state doesnt require registration you're out of luck.
Go the the gunshop or person you bought it from.
If selling the gun is banned, then buying it before the ban is no problem. If owning the gun is banned then it does not matter when you bought it.
I just bought a 58b and found the magazine at numrich gun parts.
I have bought an HVLP spray gun also and this is where I went to get more info on my product: http://www.purplesagetradingpost.com/sumner/techinfo/HVLPspraygun.html