[quote=Jim in Idaho]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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I bet thats a quick, slick shooting rimfire pump!