S/42 fire test, jammed b'z of 115 ammo

[mrerick]

There is an item in the FAQ that will help you select the correct replacement spring. It lists the spring specification for each of the variations of Lugers.

We already recommended that you check how hard the toggle is hitting the back of the receiver by putting some masking tape at the rear of the receiver.

Have you checked the small leaf spring that holds down the hold-open?