Glen,
I had Hugh actually modifiy my original grips on my swiss-style Mauser luger...had him do the full border around the grips as well. As the original checkering was so coarse and hurt my hands, I had nothing to loose...and I made this NIB gun one of my favorite shooters in 9 mm with 6" barrel.
Here is another option to consider : Buy a pair of M1929 Swiss luger Bern grips (in brown or black plastic). The red variety is too rare to use on a shooter. Save your Interarms grips and use the Swiss plastic ones for shooting. The Swiss Bern grips fit perfectly except the cut-outs for the grip safety on the Bern grips is a bit longer than the grip safety on the Interarms lugers. You would just have a slight open slot about 3/8" long when your Swiss Bern grips are placed on your Interarms luger.
I just did this with my red grips on the Interarms luger shown in the photo below. The fit is perfect and needed no "fitting" or trimming.
You can contact Stefan Mahrer in Switzerland to see if he has any brown or black Swiss Bern M1929 luger grips for sale.
Stefan's web site link is :
http://www.swissdagger.com/index.htm
