Originally Posted by Styrak
A lot of them are the same though (identical numbers on every receiver of that type).
Thats still no good. What if you lost a KJW M9? All of their serial numbers on the M9 are the same. You would probably only wanna do this if the gun was a limited edition and came with individual engraved serial numbers. Either that or you could laser your own serial numbers for your peace of mind.
P.S Lolz at the necro poster. From an investigative point of view, i was probably one of the other airsoft players who promptly repainted the gun and resold it here A LONG TIME ago. Noone would excpect to find a firearm infront of an airsoft arena.