Certainly worth a try, but I am currently out of .30 Luger ammunition. Will report any progress, when and if. Thanks......CF

I'm curious if you performed G.T.'s suggested test of firing the weapon with just one round, and verifying that the toggle locks open every single time? It is the first sentence of his post #47. G.T. helped me cure a '38 shooter of a persistent toggle operation problem, and this test was invaluable in helping us isolate the issue. You will have to do it enough to get good data - I would suggest 25 rounds, assuming it locks back every time. It is a great way to verify that the toggle mechanism is going all the way back with every round and (if successful) effectively eliminates a too-strong mainspring as the source of the issue. I think this test is especially important in that you reported the results of the tape test as inconclusive.

I haven't done the single-round test with enough trials but will do so when I have more ammo.....CF

I have a satisfactory, though embarrassed, report on my jam-prone .30 Commercial DWM. Finally got some new ammo and did various recent trials suggested by members to try to understand persistent failure to feed. Right away, Don V's suggestion to try firing one-handed and with the firing elbow locked has made a major difference. Essentially, with this firing position and remembering to keep elbow firmly locked, jams go away and cycling is normal. I never have shot this way, and will have to learn, but the jamming problem is pretty well solved. Afraid I have wasted a lot of members' time, but I have learned a lot and so maybe have some others. Many thanks and best for the New Year......CF

CF,

Congrats on finding the problem with misfeeds. NOW, you know that the luger will function with the correct grip by the shooter. You can either continue shooting it one handed with a locked elbow......bullseye shooting style, or you can do some tests shooting two handed with a proper firm grip so that the Luger is fully supported and allows the toggle train to function normally. Either way, you have a functioning Luger.....Enjoy!!

Good for you!
I know it is nice to have a functioning pistol, and to know why.