Newbie, Thrown Into The Luger World By Accident

[Doubs]

The Luger firing mechanism is really very simple. Has to be if I can understand it. LOL

A weak disconnector pin spring just doesn't seem like it could cause the problem you're experiencing. When the Luger is ready to fire, the pin is extended so that the L-arm can push it and flex the trigger bar to release the firing pin. Upon returning to battery, the pin is pushed into the trigger bar by the L-arm. That keeps the trigger bar straight and allows the sear to engage the firing pin in the cocked position. Releasing the trigger pulls the L-arm away from the pin allowing it to extend and once again lie under the L-arm, ready to be depressed to fire the pistol again. I simply don't see how a weak disconnector pin spring could cause the problem.

I can see a weak trigger bar spring - the flat spring at the back of the trigger bar - not returning the trigger bar quickly enough to engage the firing pin being a problem. Other possibilities include worn sear or firing pin engagement surfaces or too little engagement surface between the sear and firing pin to permit engagement during return to battery. But there may be sufficient engagement between the parts that lifting the toggles and returning them to battery while everything is at rest will cause it to c0ck.

If you can find someone familiar with the Luger action - G.T. for example - to troubleshoot your Luger, I'm sure a solution can be found. I can explain what the possible problems could be but unless I have it in my hands, troubleshooting it is only a guessing game.

[day late]

Originally Posted by Doubs

The Luger firing mechanism is really very simple. Has to be if I can understand it. LOL

A weak disconnector pin spring just doesn't seem like it could cause the problem you're experiencing. When the Luger is ready to fire, the pin is extended so that the L-arm can push it and flex the trigger bar to release the firing pin. Upon returning to battery, the pin is pushed into the trigger bar by the L-arm. That keeps the trigger bar straight and allows the sear to engage the firing pin in the cocked position. Releasing the trigger pulls the L-arm away from the pin allowing it to extend and once again lie under the L-arm, ready to be depressed to fire the pistol again. I simply don't see how a weak disconnector pin spring could cause the problem.

I can see a weak trigger bar spring - the flat spring at the back of the trigger bar - not returning the trigger bar quickly enough to engage the firing pin being a problem. Other possibilities include worn sear or firing pin engagement surfaces or too little engagement surface between the sear and firing pin to permit engagement during return to battery. But there may be sufficient engagement between the parts that lifting the toggles and returning them to battery while everything is at rest will cause it to c0ck.

If you can find someone familiar with the Luger action - G.T. for example - to troubleshoot your Luger, I'm sure a solution can be found. I can explain what the possible problems could be but unless I have it in my hands, troubleshooting it is only a guessing game.

I can assure you that it is not the trigger bar spring. That is one of the parts that were either missing or replaced.

[Doubs]

Originally Posted by day late

I can assure you that it is not the trigger bar spring. That is one of the parts that were either missing or replaced.

Without being able to examine the Luger hands-on, I've listed almost every possible cause of a Luger not cocking when returning to battery. There is another very unlikely possibility. The back edge of the L-arm that contacts the disconnector pin is beveled. There is enough of the edge left flat to hold the pin until the trigger is released and the L-arm is pulled away. The bevel helps the pin to release more quickly. If the bevel is too sharp and not enough flat remaining, I suppose the pin could slip under it enough to flex the trigger bar and prevent cocking. If you dry fire the pistol and continue to hold the trigger to the rear and cycle the action by hand, when you release the trigger there should be a small "click" as the pin is released.

I suppose it's possible that the trigger is depressing the L-arm enough to fire the pistol but the L-arm isn't held in far enough to engage the pin as the action returns to battery. You can check this by using layers of masking tape on the bottom of the L-arm that contact the trigger. That would push the upper L-arm farther inward and possibly cause the pin to be pushed into the trigger bar as it should be and c0ck the firing pin.

I'm fresh out of other ideas. If G.T. happens to read this thread, perhaps he knows something I've missed.