My late father had a German 16 gauge side by with double un derlocking lugs and Greener crossbolt. A nice gu, but it had shot loose over the years. He took it to a gunsmith in Fresno. This fool proceeded to lock the barrels in a padded vise and peened the underlocking lugs and the crossbolt extension with a center punch. This was his idea of tightening up the action. I was 16 at the time and while I was able to shoot it, I had my concerns. In Christmas of 1975 I got the gun for a Christmas present. I turned around and took it to a gunsmith in Sacramento. He helli arced the peens and filed them down to where they were flush with the lugs and crossbolt extension. Never had any problems after that.
