Hello again. Oh, the joys of working on antique middle eastern firearms
After reading your last Post, and again looking at your photos. First of all the Hammer Screw: I looks like it may have had a slot for a screwdrive at one time in the past (?). Maybe the threads were so worn, and maybe an ear was broke on the screw head, someone just hammered it flat to keep the hammer from falling off. That would explain the brass washer under it. You might use a hacksaw
and cut a slot on the head so you can use a flat blade screwdriver and try to remove it. Of course, this assumes that it actually is threaded into the tumbler/shaft. NOTE: I have seen locks where the tumbler and shaft are one piece. And others that are two pieces.
The Barrel: Hmmmm. It would be interesting to know if that pin that goes from the sling swivel is threaded to the barrel tang. Or is it just a pin that is hammered to the tang. I can't tell by the photo. The small pin at the sling swivel would have to be removed in any case. It's probably malable iron and would be easy to file narrow - just enough to remove it. Keep me posted on your progress. Your's has all kinds of interesting twists and turns to dis-assemble
By the way, Afgan rifles are noted for this. Most saw so much hard use that when a repair was needed in the field they likely resorted to whatever method of repair was available with no gunsmith available. Their guns were probably in a constant state of repair. But this is part of the "mystic" I find so interesting about these guns. Again, thanks for posting. Rick.