I have a Yugo underfolder that I purchased from Century. There are two items on it I can't figure out. The first is a tab at the base of the shoulder rest. I've highlight it in red in the folder. At the bottom of the shoulder rest on the pic. What is the tab for?
http://i348.photobucket.com/albums/q...psaccac26e.jpg
The second item is my AK has two rear sight blades. One of them is on a swivel so that it can be used when the rear sight is in the vertical position. At least that's what it looks like. The problem is the rear sight can not be placed in a vertical position and stay there because there is no detent or stop to hold it there. Anyone know what the swivel blade is used for? This one is a set up as a grenade launcher if that helps.

