I came across this parts kit, and jumped on it. So now my Stainless USP will have an HE back-up upper to it.
It's certainly a strange kit. The firing pin is there, but no firing pin spring. The entire recoil assembly is there except for a snap ring and recoil spring retainer. Obviously the barrel is missing. The hammer spring is there, no hammer strut or hammer. Hell, the entire hammer box is gone except for the control latch/catch. Mag release, but doesn't appear to have the mag release spring. The trigger axle is there, but no trigger or TRS. Very weird.
I'm going to get the parts needed to make this a complete slide so I don't have to swap any parts out between the stainless and the HE gun. I've got an extra barrel sitting around already for it. I will be interested to see if the ghost ring sights are better. However, since I've got tall sights on my stainless slide, I might throw these up for trade for some adjustable tactical-style sights for the sake of conformity.