[–]19306096?0 points
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A lock is the bit that holds a flint or match in a flintlock or matchlock firearm. Now we use percussive primers (usually) detonated by action of a hammer dropping with the force applied by means of a mainspring.
[–]19305289?0 points
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When I was an active duty Marine, it meant, one in the chamber, safety engaged. The saying may have originated when guns had external locks, but I don't really know.
[–] 19304844? ago
I did a search on qmap of "loaded" came back with a few results however I wasn't able to make any connections.