I am sorry I couldnt see the picture well. I did'nt ntoice it was a TS or shadow (they don't have FPB) One thing you can do to isolate the binding is using an eraseable marker, mark or paint the parts that make contact. The barrel, the slide rails, the hammer, the inside of the slide that makes contact with the barrel. The slide lock pin and contact point to the barrel, the portion that locks the barrel to the slide when you rack the slide, etc..
Mark or paint the parts that make contact one section at a time. Maybe this will help you isolate the area that's binding.