I recently acquired a nice .58 caliber Zouave rifle that is a real fun shooter.
The only problem is my old bifocal eyes can't see that danged military rear sight. Here's the gun.
And here's the factory sight. With it, the gun shoots about a foot above point of aim at 50 yards.
Here's the sight disassembled.
That disk is the screw holding the sight to the barrel. When I got it out it turned out to be metric - 4mm / 0.70 pitch.
So I went to the hardware store and bought three bolts (1/2" X 20 threads per inch), and a nut.
I also bought a 4mm X 0.70 machine screw, a small rubber "O" ring, and a nylon washer.
Then I cut the head off of the machine screw and put it in the barrel in place of the sight base screw.
I drilled a hole in one flat of the nut and tapped it with 4mm X 0.70 threads. Then ground it flat on both sides and rounded it except for the tapped flat.
Here's a picture of the process in three steps.
Then a buddy with a lathe drilled the bolts with 1/8", 3/16", and 1/4" holes, rounded and dished the heads, and shortened the shanks to the thickness of the modified nut.
I then put the "O" ring on the barrel stud, then the nylon washer, then screwed on the modified nut.
This in itself makes a pretty dandy low-light ghost ring sight.
Or, you can screw in any one of the apertures for finer sighting in good light.
Here's a picture with the 1/4" aperture in place.
As soon as I can get some Birchwood Casey cold blue solution, I'll turn the whole works blue and it will look a little better.
RESULTS??? Well, I shot with it last Sunday from a bench and put six shots in a 3" bull at 50 yards using the 3/16" aperture.
Windage was perfect, but it was shooting about eight inches above point of aim. I needed a taller front sight to bring the point of impact down.
So, back to the hardware store. Got a couple of 4 X 40 socket head screws and a brass nut. Rounded the nut, filed the factory front sight flat, and soldered the nut to the flat. Now I can screw in different lengths of screw shanks (or screws with the head on) and change front sight height at will. The threaded post is real sharp when looking through the aperture. Works great with my bi-focals on.
Now I'm thinking about drilling a hole through one of the socket heads and inserting about 1/4" of fiber optic filament.
GO AHEAD - LAUGH, but I do think I'm about ready to hunt with this sucker. It's about the best $5 aperture sight you'll ever find.