Vent Plug

Vent Plug - A flush-mounted, threaded insert in the side of the breech of a percussion gun, normally made of platinum in order to resist erosion better than steel, with a very tiny hole bored through to allow the escape of a bit of gas, the passage of which cleans the ignition pathway. Also, Blow-out plug. Often seen peened over by the uninformed. Not necessary in a flintlock because the [larger] touch hole easily fullfills that purpose.



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