amount to much when using the gun swiftly,from the leather. 20 LPI checkering matches them, but weakens the frame a lot, especially where it's beveled for fast mag swaps. So it's best to just peen the serretatins flat, and then stipple the front strap. The mainspring housing will benefit from a 20 LPI checkering. It's just serrated vertically, so it has little "holding power" vertically, as in recoil control when your hands are sweaty, bloody, numb with cold, etc.