Mount Sweetness, I don't know if you would be interested in trying this or not. Let me give you a bit of history first. Several years ago, I bought a 7.7 Japanese Arisaka, type 99. It came with a couple of other rifles where I had to take the lot or nothing. It was clean and not ground as well as all intact, including the dust cover and chrome lined bore. Delis is now the proud owner and found that it had a broken rear trigger guard screw.
I don't remember shooting it and don't have any records showing that I did so, I probably didn't. Maybe Delis could chime in here if he reads the thread.
What was really impressive about the rifle, to me anyway, was the rear sight. It was a tangent peep, with the orifice cast in the place of a normal "V" notch.
The ease of sight acquisition was absolutely amazing. It also was easily acquirable in low light. The front sight on the Jap was a rather large barleycorn and that helped a lot as well.
Anyway to make a long story short, seeing as the sight was so impressive, I decided to adapt the mid war, expedient, 300/500 yard "L" style sight used on the No4 MkI*, to the rear tangent sight base of a Brazilian, 7x57 Mauser that some previous owner had chopped the barrel and stock on. I was extremely lucky when I fired the rifle and found the sight to be bang on for the horizontal plane but of course shot very high. That was easily fixed by the judicious addition of an extremely high front sight that came in a box full of Mauser spares. Needless to say, it is a very nice combination. I like it a lot. I thought it might have the drawback of being to large and blocking the target or animal. Well, it all turned out perfectly, it works like a "ghost sight" and is only visible as a shadow which surrounds the front sight. It works even better than I imagined. The Japanese had an extremely good idea with that rear sight. I don't know if they were trying to emulate the Enfields or Lee Enfields because they were so effective or if it was just a revolutionary idea. Whatever, it was a brilliant move and so easy to use.
It is a cheap fix and easily done. The rear sight base on the swede Mauser is almost identical to the 1935 Brazilian in style so, it is an easy swap, that doesn't require any gunsmithing or machining and doesn't damage any parts. The sight may need to be filed to fit or have shims added to keep it in place. If your really handy and have some basic hand tools, it would be easily made out of a piece of scrap steel.
