If you can find one that can be fit properly, the best approach would be to replace the entire toggle train (including the complete breech block, forward and rear toggle pieces, and all the axles and pins.
These parts are all hand fit, and the dimensions are critical to proper operation and headspace of the loaded cartridge.
This, honestly, is not a task for a novice. Your best approach would be to contact Tom Heller or another experienced Luger gunsmith.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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