One aspect that may have had a great influence is that of lubrication.
The original Luger manuals state that for lubrication an acid-free vaseline should be used, and the Swiss held on to their gun grease for quite some time. Nowadays we have excellent gun oils that can withstand temperature extremes and leave very little residue after being applied.
It isn't difficult to assume that the combination of a grease like substance and outdoor use can quickly lead to a situation where the gun parts will stick together like they were glued.
With modern cleaner burning powders, good gun lubrication products and recreational shooting all these risks have been virtually eliminated.
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