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I noticed when cleaning my 9mm conversion that the area in the yellow rectangles on the rear of the the bolt and on the extractor angle .......
...are striking the corresponding areas in the yellow rectangles here....
The softer aluminium has yeilded to the steel and I have since relieved the areas on the receiver block so there is no contact. Has anyone else noticed this on or in any caliber?? (9mm-.45-.40)

...are striking the corresponding areas in the yellow rectangles here....

The softer aluminium has yeilded to the steel and I have since relieved the areas on the receiver block so there is no contact. Has anyone else noticed this on or in any caliber?? (9mm-.45-.40)