At a gunshow earlier this year I bought a 121 in really great shape, especially so for a rifle made in December, 1939. It had been d&t with two holes on the receiver but that turned out to be somewhat of a good thing since the holes were exactly .860" on centers so a Skinner sight fit perfectly. The alternative would have been to search for an old Lyman tang sight which is fairly scarce and expensive and isn't windage adjustable.

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The epilogue to this story is that I had cataract surgery recently and can now see open sights almost as good as I could decades ago. Turns out that the factory rear sight (taken off for these pictures with the peep sight) allows a perfect sight in at 75 yards. A tap of the front sight centered windage and I was ringing a 4" steel target at 75 yards darn near every shot so the Skinner was put away for another day or another rifle.



Yes, I know this has little to do with the OP but it is an opportunity for me to talk about me, so... wink

Gunnery, gunnery, gunnery.
Hit the target, all else is twaddle!