Colt collectors call this a "campfire switch", i.e., a cavalry unit gets issued pistols all in the same serial block. Routinely or after an action they all gather around a campfire, throw a blanket on the ground and as they clean their individual pieces, throw the parts onto the blanket and move onto another area of their firearm. A trooper sitting next door picks up the part he believes is his and this part a number or two away ends up on his gun.
They didn't care, as long as the assembled gun worked.
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