Howdy
I have lots of lever guns with buckhorn sights on them.
This is a Full Buckhorn sight on a Marlin Model 39. Notice there is an adjustable insert with a small notch that can be raised or lowered. However with a Full Buckhorn sight like this it is common to use the sight similar to a ghost ring and allow the eye to center the front sight in the center of the 'ring'.
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The next few sights are all variations of what are called Semi-Buckhorn sights.
This is a standard Marbles Semi-Buckhorn sight that came standard on an Uberti replica Winchester 1873. There is a sliding insert with a small notch in this one too. These sights usually come with a white diamond to help the shooter see the rear sight better, but CAS rules require the white diamond to be blacked out. So it is blacked out.
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A folding Semi-Buckhorn sight on a vintage Winchester Model 1873. The blade can be folded down so a folding tang mounted peep sight can be used. This one also has an adjustable insert in the blade. At one time the diamond was probably filled with white paint, but the paint is long gone.
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A Semi-Buckhorn sight on a modern Marlin Model 1894 carbine.
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A Semi-Buckhorn rear sight on a vintage Winchester Model 1873. Notice the notch at the bottom of the sight is really, really tiny, and it is not adjustable in the body of the sight.
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An inexpensive Semi-Buckhorn sight from Track of the Wolf on my Uberti 1860 Henry. I replaced the original ladder sight with this one. The notch is nice and big and it is easy for me to center the front sight in the notch.
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This is a Flat Top Buckhorn rear sight on a vintage Winchester Model 1894. A sight like this is good for hunting because it does not obscure the target as much as a Full Buckhorn or Semi-Buckhorn sight does. This one has an adjustable insert and a pretty big notch.
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Now just so you don't think I am a spring chicken, I just turned 70, and have been wearing glasses with lenses as thick as coke bottle bottoms since I was six years old. I guarantee you my vision was much, much worse than yours. I have been able to make all those sights work with my admittedly terrible eyesight. Most of my lever gun shooting is in Cowboy Action, and I am not concerned with pin point accuracy at 100 yards. I just place the sights in the center of the plate and pull the trigger.
I bought this vintage Winchester Model 1892 about 20 years ago when I first started shooting CAS. In those days I used to shoot regularly at a club that had a big steel bear target set out at 100 yards or so.
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I removed the rear sight. I don't even remember at this point what it was. I had a gunsmith install this folding rear sight. It was a standard item out of the Brownells catalog.
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And I had him mount this folding, tang peep sight at the rear. The idea was, for normal close up shooting I used the folding sight. For the bear I would pop up this peep sight. I kept it sighted in for 100 yards. This is a standard Lyman rear sight, you can even see the name Lyman on it. Note: this rear sight is only adjustable for elevation, not for windage.
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The other choice is a Marbles folding tang peep sight. These are adjustable for both elevation and windage.
http://www.marblearms.com/standard-peep-tang-sight.html
Brownells carries the Marbles rear sights. Click on the link for the chart to see which rear sight will fit your rifle.
https://www.brownells.com/rifle-par...2-improved-peep-standard-post-prod105970.aspx
The Lyman sight is also available from Brownells. It is marked for the Model 1894, but I suspect the spacing of the holes might work for a Model 1892 also.
https://www.brownells.com/rifle-par...rear-sight-black-sku539050002-7961-20224.aspx
By the way, I had cataract surgery in January of this year and can now see 20/20 with my right eye (my aiming eye), about 20/30 in the left. I have not had much chance this year to bring my lever guns to the range and see how well I can see the sights with my 'new eyes'. I expect there will be a bit of improvement.