Details of five Pennsylvania Long Rifles.
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A color picture of five rifles, at carrying angles to highlight different sections of the Pennsylvania Rifle.

Credit: ©Jerry Millevoi Photography,

The Corps of Discovery's food supply and self-defense depended on muzzle-loading, long-barreled flintlock rifles. Lewis equipped the expedition with fifteen .54 caliber U.S. model 1803 rifles, specifically designed for the U.S. Army, which he obtained at the federal Harper's Ferry Arsenal.

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