It's been over 40 years since I had a Star PD, and I can no longer remember all the details. I don't know that there is an "advantage" to it, or not.
Can you cock the hammer with the safety on?
It looks like a 1911 but the internals are slightly different, and it may just be the way things are made inside that allows the safety to go on with the hammer down, and not a specifically intended feature.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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