Hello All,
I have a confession- I waited until all of my model 12s had benefitted before sharing the following tip.
If you didn't realize this, it appears that the Oversized Safety for the Winchester Model 50 works just fine in the Model 12.
Without mentioning names, I have found/bought/installed 2-3 of the ones labeled for the Model 50 in my Model 12 shotguns [and one in my Model 50]. They fit/function exactly the same.
There is a parts house that shall not be named which carries them, but they don't cross list them between the two models. You would have to know to look for them.
So- if you like the oversized half-circle safety design, keep your eyes open for them listed for the Model 50 also- you may find them faster.