Winchester 69A Scope Mounts

[GearGrinder33]

I have a Winchester 69A post WW2 with grooves along top of receiver. What scope rings fit on grooves? I purchased some and they don't seem to fit correctly. Anyone have any information? Provided some pictures as well.

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[Horrendo Revolver]

Did you buy rimfire rings?

[edgerly779]

I have a mag or that. 10 round winchester mag. I sold my model 69 long time ago.

[Sailormilan2]

My understanding is that US made guns use a 3/8" groove size, while European guns use 11mm. I've been using use sized rimfire bases on my European made guns, and they fit like those in your photo. But so far I cannot see that it causes any problems.