Amazingly I caught a picture of the only Shield jam I know of.
Several ladies I know have the 9mm Shield.
I gave one about 900 rounds of Russian steel case 9mm to blast away.
I was snapping a few pictures when the Lady was at my place, shooting the last of the Russian ammo.
In a chance in a million I happened to catch a picture of the Shield's slide in full recoil, as the fired case spun backwards, instead of ejecting from the gun.
In the next instant the 9mm case jammed the slide as it traveled forward.