I had installed Herretts cocobolo grips on my PPK/S-1. They are a steal from CDNN. Sanded the checkering down until they are smooth with a nice pattern.
Came back from the range where I found out I was having trouble maintaining the magazine with the finger extension locked into the gun.
Turns out the bottom edge of the Herretts grips is straight. The bottom edge of the PPK/S-1 is not. There is a step between the edge of the magazine well and the mainspring housing. You need to have the grips follow this step or you will not reliably lock the finger magazines in the firearm. It took a moment with a Dremel belt sander to fix the grips and now it works fine.
Came back from the range where I found out I was having trouble maintaining the magazine with the finger extension locked into the gun.
Turns out the bottom edge of the Herretts grips is straight. The bottom edge of the PPK/S-1 is not. There is a step between the edge of the magazine well and the mainspring housing. You need to have the grips follow this step or you will not reliably lock the finger magazines in the firearm. It took a moment with a Dremel belt sander to fix the grips and now it works fine.