Post here the common tech problem of our AK and possible solution...
One of the top of the list...
The Cutoff Lever (Yaw Control Bar).
Problem: No Single Fire even in Single Fire Mode.
Click:Large File!Cutoff lever tends to wear out (red arrow) after a long period of usages(single fire mode).
Most possible solution is replace the parts, a Guarder or Deepfire Cut Off Lever.
Guarder:

Other solution, modify the cutoff lever, a do it yourself mod.
Soldering lead is not advisable, the lead too soft and wear out easily.
Epoxy maybe use...or leave the problem as is.