[Ron Wood]

Usually the stock lug on the Luger "bottoms out" in the groove of the stock iron, so the groove needs to be a tad deeper. I use long handled file with a curved cutting surface called a "riffler" to remove the small amount of metal needed to make the stock fit. I go slowly taking a little at a time and checking the fit frequently. It is a good idea to stop when you can get a tight attachment that requires a bit of wiggling to get the stock on. It will loosen up on its own over time, particularly with repro stocks that tend to have a bit softer metal in the iron than originals.