As you will obeserve the pix you will notice a discoloration on the rails just on top of the firing pin [not the side rails!]. The rails I was referring to here is part that houses the firing pin and spring. I learned that this actually touches the no. 10 [sear] on the user's manual. My conclusion was that this parts should be properly oiled.
I guess there was a question in a previous thread whether this part was safe to grind or would breach safety of the handgun.
I guess, on my own opinion that this can be grinded slightly to the point that is does not touches the sear. The sear would not be moving much further up as it has a limitation of movement. The rail should not serve as a stopper for the sear in moving up. Sear should serve only to hold off the firing pin when cocked and release the same when trigger is pulled. But again the sear touching the rail should not be so much of a concern unless pistol has consistenly having issues of going battery or any issues resulting from it.
This is just my opinion... do not use this to solve your issues. :wink:
[Please do not apply my conclusions on this subject or take it at your own risk]