Performing the test I described requires no disassembly, and no contortions. I can hold the trigger and hammer with one hand, and depress the firing pin with the other. The test takes ten seconds, beginning to end.
Where are the dimples on the FPS? Sometimes, people will apply a punch near the edges, kicking-up burrs that tighten the fit in the slide. It's not something I'd expent to see on an unmodified, stock gun.