Colt Gold Cup some time in the late 90’s. It was a range gun that probably wasn’t maintained well. In could feel the grittiness of the slide returning to battery (I’m assuming because it wasn’t cleaned/lubed well). It felt like it was retunring to battery in slow mo.
That being said, I was impressed that when looking at the back of the slide, the slide and frame looked like one piece of metal until you racked it.