I made an adapter that made side mount rings centered

[Clark]

Working on updating a 1948 22 pump rifle to 1955 standards.
The old 1948 has (4) 8-40 holes drilled and tapped in the side.
The newer 1955 has a dovetail cut on the top for tip off rings.
There is an adapter, a Weaver 48402 [side mount base gloss] that has concave radius to fit the top of the receiver. That attaches to a Weaver 49350 [1" detachable side mount rings].
Two things wrong with that:
1) I did not want to drill holes on top, and turn the old rifle into Swiss cheese.
2) That would put the scope off to the side of the rifle, and Mickey Mouse would not ever like that.

I could mill dovetails in the top of the receiver.
But this seemed like an opportunity to get the center of the scope not only over the receiver, but lower than can be done with tip off rings.
So I designed a wedge shaped Aluminum adapter to be used instead of the 48402.
It has 10-40 female threads for the attaching knurled knobs, so I had to wait for a 10-40 tap to arrive from Enco.
I filed off the sharp corners.

 

[Clark]

I put my modified Leupold bore sight on it
The reticle could move:
a) up 32 minutes of angle [moa]
b) down 30 moa
c) left 25 moa
d) right 32 moa
Which means someone drilled those holes on the side very accurately, and I made the adapter very accurately.
I left it centered right to left and shooting 4 moa high.
Comparing the old 1948 with scope 1.1" over the bore to a newer 1955 at 1.5" over the bore we have made an improvement.

 

[Dixie Gunsmithing]

The good ol' 61. I just had one, like new, stolen from me last year, and it never did turn up.

That was a very accurate rifle, for a pump, and it fed about anything I put to it. You have to keep the bolt clean on them, though, or at least the rim slots.