A few thoughts.
1) If the distance to your sight dovetail was over 4", it's kinda hard to stretch a mount - but since the distance is less, it's a piece of cake to anchor the front in the dovetail, cut off whatever hangs off past the rear of the front receiver ring, drill two new holes in the mount over the front receiver ring, and D/T the receiver for the rear.
2) I, for one, sure wouldn't be D/T'in any holes the the front receiver ring of ANY 1942 model. The onlyest holes I'd punch in would be on the side for a peep.
3) YEARS ago, there once was a mount made, for LER handgun scopes, that fit in the rear sight dovetail and the forearm's barrel band - but finding one of those today ranks right up there with finding a hen's tooth.
4) If it was my rifle, and I just HAD to have a scope, I would investigate B-Square - who used to make a clamp-on type scope mount, for a handgun scope, that might be able to be adapted to the rear sight dovetail.
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