That "foot" is the disconnector!
If it's holding the slide open, there is something wrong.
Pull the slide back with the grip off and see how it works.
In theory, yes-but I have never seen a 950 with a weak recoil spring. I have seen them with one side broken.
A bent trigger bar, or lack of lubrication is more likely.
Ok - had to be 100% sure about my 950 EL so - I dug it out of the safe.ALL 950s have a tip-up barrel.