Quote:
Originally Posted by alanint
The stripped upper receiver forms a "tuning fork" that when gently tapped on a non-marring surface, will ring. Repaired, re welded, cracked or messed with upper receivers are not supposed to "ring".
This is more lore than science, but some people do it.
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Here we call it a "diapason".
I'm not really an expert on arties, but
I would never shoot that Luger!! 