[Johnny C. Kitchens]

My first and second WWII Lugers (byf 42) jammed like crazy. Then I read about replacing the magazine, specifically a Swiss version. I did and the gun improved dramatically. I then went through the gun cleaning out crud from all of the little places inside the gun, especially where movement occurred. I used Break-Free CLP to lubricate, but not excessively.
I also had to clean the barrel, with a lot of elbow grease. The barrel was really full of black carbon build up, although it didn't look it. I was rewarded for my time with an impressive shoot at the range recently.
It shoots wonderfully now. Only Corbon ammo didn't work so well. The best I tried, Federal Hydra-Shok +P+, which functioned perfectly and produced groups that were fabulous, and on target for the sight settings that were set when it left the factory in 1942. I'm definitely going to buy more of that ammo...