Where can I find a selector switch cover? What is it called?
 

I've lost the cover for the opposite side of the Magpul AEG reciever that mimics the opposite end of the selector switch but merely covers the open hole on the other side of the reciever.

I've tried searching for a few things such as selector switch cover, selector switch plate, etc. but I am having no luck finding one.

What should I be searching for if I am needing to buy one?

That part, as far as I have researched/seen, has never been sold as a aftermarket replacement.

I believe the reason for this is because different bodies used different attaching methods. Some used slide method, while others used friction attachment. So there was no way anyone could make an universal replacement.

The only one that ever comes close to is the King Arms right side selector lever(dummy). Even this will have problems fitting with some bodies. Personally I had to epoxy mine onto the CA Metal body because I was missing the same part as you.

http://www.airsoftparts.ca/store2/in...oducts_id=1510

Just take a piece of plastic and make one.

Yep, that's all I did. Took a plastic bingo chip and cut it down to size.

http://i11.photobucket.com/albums/a1...entcover-1.jpg

After paint

http://i11.photobucket.com/albums/a1...ured/done1.jpg