glad I found this thread, though it's a bit old. I did not want to deal with punching the rear sight off, though I AM concerned with the striker block bore being gritty (thanks to Bob's videos again!)-- I don't feel a noticeable difference when manually activating the block though.

ill be looking at 100-063 sooner than later, as like someone else posted, i've shot low left on mine... however I did find myself flinching the last time at the range. =(

when dry firing, the muzzle seems to jump regardless of what part of my finger I am using to pull it-- be it at bend, tip or in the middle of the pad.