I was reading the section in the manual about doing the firing pin safety check. It says, "Pull rearward on the lug of the firing pin, pulling the firing pin all the way to the rear of the slide and then ease the firing pin forward until it stops in contact with the firing pin safety". When i tried to pull rearward on the lug, it wouldnt go all the way back. Instead it would only move a tiny bit and then firing pin safety would click. I didnt put too much more forece into trying to pull the lug any further because i was worried i would mess something up. Is this normal or am i not doing something right?