mounts
I've not bought a mount for my PSL, but I have considered at a lot of options. I cannot say if the Zastava M76 uses a Drag or AK sidemount, but they are different......typically an AK mount will not lock and remain solid on a PSL/Drag.
FAB arms makes a mount for the Drag family, expensive. Kalinka and Red Star Arms sell more affordable versions. I've never examined any of them.
One option I nearly committed to was the Texas Dogleg, which eliminates the use of the side rail all together.