Since ive been doing research on the MG34, i have seen people talk about the little box on top of the box for the feed tray. No one ever quite knew what it was. Well iam pretty sure its what is referred to as "feed claws " for the drum mag for the mg34.
Here it is on a dissasembled tray cover:
Seperated:
On an assembled MG above the feed for the ammo:
And lastly a pic form the Looksirdroids website:
This is the article where i learned the name, it starts at post #10. Good dissasembly walk through.
http://www.ww2incolor.com/forum/showthread.php?10307-Firearms-Disassembly
If all this is known already iam sorry, just never really saw this info posted.