The O frame stocks usually take the small size grip cap. But, earlier 0 frame 16g guns can be a bit of a wild card and can take the normal sized cap as used on larger frame sized guns.
If you are looking for New (or even good used caps). Feel free to contact me. I have pretty much any size and variation you may need. And I can double check dimensions of it to make sure you are getting the right one.
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B. Dudley
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