I'm having issues with my gen 1 M9 and I suspect I could be missing a part or something is damaged. I replaced a broken firing pin guide rod already, fired a few test shots and it immediately broke the same way again. There is a gap between the end of the guide rod and the plastic cover on the back of slide. The guide rod has room to wiggle back and forward and I strongly suspect it shouldn't. It looks as if there is supposed to be another part inbetween them in the gap, but there isn't anything like that in the schematic. Do I need a new slide cover? If so where do I even get one? Because they don't sell them on Steyr's website. I can get guide rods and firing pins but could find no back covers.