As noted above the pre war Model 94 *rifles* were drilled and tapped tang sight and those vintage Marbles and Lyman tang sights were awesome sights. The pre war Model 94 carbines were not drilled and tapped.
In 1933 Winchester started drilling and tapping the Model 64 rifles for the Lyman 52A receiver sight as well as the tang sights.
This Model 64 is drilled and tapped for a tang sight but wears a Lyman 62A receiver sight.
However it was not until 1952 that they started drilling the Model 94 carbines for receiver sights, by that time the nearly identical 62A sight. A 1952 Model 94 carbine tapped for a receiver sight above a pair of 1950 Model 94 carbines without the tapped receiver. All three however have vintage Lyman or Marbles tang sights.
The Lyman 1A sight on this 1926 Model 94 rifle is near gun art, exceptionally well made and extremely practical with a flip out aperture to allow a larger aperture for low light conditions or shooting at close range at moving targets. They had practical iron sights down to an art form.
With a tang sight, the pre 64 Model 94 rifles and carbines and most post 63 Model 94 rifles are capable of very good lever gun accuracy (100 yard group with the 1926 Model 94 26” rifle.)
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The modern Marbles and Lyman tang sights don’t impress me nearly as much. The current (since the mid 1990s) Lyman No 2 sight uses an o-ring to provide friction on the elevator barrel but doesn’t have an effective lock. It does have index marks that you can fill with paint or wax from a crayon to mark a zero, but it’s a bit rudimentary and makes holding a zero problematic. It has no windage adjustment.
The Marbles sight has adjustable windage and elevation with 8 clicks per turn on each, and with each offering about .4 MOA of adjustment depending on barrel length and resulting sight radius. However the windage doesn’t lock and the lock is poor on the elevation.
Modern Marbles Standard Tang Sight
Modern Lyman No 2:
With any tang sight, if you plan to use the sight for elevation adjustment for different ranges it absolutely must be mounted perpendicular to the tang to avoid an increase in elevation from adding or subtracting windage. And or course canting errors will increase the higher the sight is above the bore.
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The Williams receiver sight is very similar to the Lyman 62A and both are available in finger adjustable or lower profile coin adjustable models. Here’s a Williams FP-94 on a Model 94 Classic 26” rifle.
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With either a tang sight or receiver sight you’ll want to remove the rear sight and replace it with a sight blank to improve the sight picture.
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Marbles makes a tang sight for the current Miroku made Model 94s with the tang safety but it’s just not comfortable or practical as it interferes with the thumb going over the top of the tang. (Even with the adjustment knob reversed to the other side.)