I 1000% agree with G.T. and gunbugs
Legacy Collectables and Tom are as honest and true as they come.
The trigger bar plunger must freely travel in the trigger bar or your gun will not reset properly. You should be able to clean the plunger without removal if you are hesitant about taking it apart for a proper clean. Removal is fairly simple by removing the trigger bar plunger pin but be warned ... it is a very tiny pin and can be lost easily ... set it down in a small container not on your work bench.
Also be aware that the plunger is under spring tension .. do not let the plunger and spring fly out of the trigger bar, control its release.
Also make sure your trigger lever freely travels on your trigger lever pin ... sometimes rust and/or crud limits its free movement.
It doesn't hurt to remove the trigger lever pin and the trigger lever and give them a good clean and the trigger plate as well.
Examin both ends of the trigger lever for excess wear.
Reassembly can sometimes be a bitch so be sure you orient the trigger lever properly. Taking a phone pic before dismantling anything is a good way to keep track of what goes where if your new to this.
If it all seems to daunting best go to a gunsmith, especially if the gun is collector grade.
https://www.gunpartscorp.com/gun-man...rer/luger/p-08