On Friday, January 16, 2015 at 5:27:50 AM UTC-6, David R. Birch wrote:

When I have a slotted gun screw with a burr in the slot, I put the screw
in an aluminum jaw vise, then use a narrow flat face punch and a small
brass hammer to tap the metal back into place. This gives a stronger and
better looking slot. A touch of cold blue and its good to go.

David

Hey, I like that. Thanks for the tip, I'll try it.