I think the real Russian AKs are more common than Khyber Pass specials, even in Afghanistan, but certainly in Iraq and Syria.
Not going to lie, after 50+ years of hard use most of them had some bubba to them
but I don't think they were anything handmade like a Khyber Pass special.
There was an interesting ak we captured (not a russian) that someone had taken an M4 lower handguard and screwed it to the handguard area of the ak with a single woodscrew among other things only afghan bubba could dream up in his cave. I think I posted a picture with it in the background somewhere on this forum.
Again, wish I had thought to take more photos of the guns...