Dfariswheel, I built one of those 3-inchers
Found an unused full-underlug 3-inch DS barrel and had an old run-of-the-mill PPS in my safe. So I had a 'smith put the newer tube on the older, full frame PPS. I may have the only gun that combines the two.
The shape of the 3-inch tube is just the same at the muzzle as that 4-inch in the picture, as you pointed out. I rather like it, it is even stylish.
Bart Noir
Who needs to go shoot some D-Frames after reading this thread.