I think you're describing the gap between the front of the breech block (where the extractor is located) and the rear of the chamber.
A very small gap may be normal. You may also have a problem with dirt under the extractor. Too large a gap may cause a headspace problem which can become rather dangerous. The rear of the cartridge base needs to be supported by the face of the breech block when the Luger is in battery.
Marc
__________________
 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
|