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Harmonica Gun

A harmonica gun or slide gun is a form of firearm which was breach loaded with a steel slide, containing a number of chambers bored in it and which were filled with projectiles. The vast majority of Harmonica guns are pecussion cap guns, although there are a few designs for compressed air guns. In percussion cap guns, each chamber contains a separate primer, powder charge, and projectile. The slide was inserted in an opening in the breech action and could be advanced by releasing the camlock, moving the slide by hand.