The mainspring strut/retainer/guide may be bent.
Even with the correct coil count the mainspring may be too long and bunching up enough to "lock" when at full recoil.
A picture would help- grips removed with toggle held back at full recoil- showing condition of the spring.
If the toggle is hard to fully open by hand, something is wrong with the mainspring/strut length/size/ or alignment. JMHO.
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03man(Don Voigt); Luger student and collector.
Looking for DWM side plate: 69 ; Dreyse 1907 pistol K.S. Gendarmerie
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