Identify this 1911 part

[Twystd1]

It's an ambi safety with the other safety lever missing.

YUP

[tdaughg]

the pin with the box around it is the hammer pin not the right side of an ambi safety. the safety uses the rearmost pin which is also used for the grip safety. just look at the picture and you can see the safety uses a different pin than the op has highlighted.

[brassburnz]

the pin with the box around it is the hammer pin not the right side of an ambi safety. the safety uses the rearmost pin which is also used for the grip safety. just look at the picture and you can see the safety uses a different pin than the op has highlighted.

+1

I'm sitting at the computer with my Para P-14. The box indicates the hammer pin. I have never seen a broken hammer pin. I have seen them ground down flush for fitting an ambi-safety. Perhaps this pin was ground down a little too much, so it sits lower than flush with the frame.

[goober]

lol @ folks saying it's an ambi safety.
clearly hammer pin location.

[chuckdc]

lol @ folks saying it's an ambi safety.
clearly hammer pin location.

The King's Gun Works ambi-safety on my oldest P16 uses a dovetailed hammer pin to secure the right side piece of the safety. That style of safety was much easier to install on wide-body 1911s because it lacked the little tongue that goes under the grip panel. On a Para, you would either have to cut the tongue piece or cut a slot into the frame to accommodate it.

So, it is therefore quite possible for that broken hammer pin to be a remnant piece of an ambi-safety.

[goober]

The King's Gun Works ambi-safety on my oldest P16 uses a dovetailed hammer pin to secure the right side piece of the safety. That style of safety was much easier to install on wide-body 1911s because it lacked the little tongue that goes under the grip panel. On a Para, you would either have to cut the tongue piece or cut a slot into the frame to accommodate it.

So, it is therefore quite possible for that broken hammer pin to be a remnant piece of an ambi-safety.

possible, yes.
still probably wouldn't be the 1st guess.
granted, OP complicated things by posting a pic of a pistol other than his.