Hello everyone. I am in bad need of some tech support. I have two 20-round Saiga-12 drums from ProMag. One works great and the other doesn't. On the one I've been having problems with, I disassembled it, and tried winding the spring up some more to put more tension on the spring. That didn't work; I'm still having FTF problems. I'm using an adjustable gas plug (Tac-47). This drum is not that old. Any help would be greatly appreciated. Anyone wanting to offer help, can also email me at email@example.com if that is easier for you.