[unclebob]

I have done the .25 cent polishing job on all of my Glocks using Flitz and a Dremel tool at low speed probably no more than 5 seconds in any one spot. Have not missed up any parts so far.I have not done so but polishing the hole firing pin might help with it being something for the spring to slip by on. How much more difference it would make?????

 

[unclebob]

If you’re mechanically inclined and can afford a 35 dollar risk, you can take a pass or two on the lug face with some 800 grit sandpaper. Key is to keep the angle EXCTLY the same, peferably use a flat piece of glass under the sandpaper. Idea would be to remove any burrs or tooling marks. If it goes full machine pistol and you shoot your eye out, don’t say I didn’t warn you.

You do not want to use sandpaper or file, only polish and don't want to get carried away with that.