**AIRSOFT GUN HELP** looking for a CYMA AK47 metal Receiver top?

I have had Double Eagle M86 (AK-47) airsoft gun for a while, and it has been giving me troubles lately. So i decided to take it apart and investigate. i fixed the gun and while putting it back together for another war, i broke the receiver top which is made from some sort of flimsy plastic. You can play with the gun without the cap but it doesn't look the same. Is there any site that i can purchase a receiver top from without buying a totally new gun? Please help!!!