Collectors and historians recognize the subtle technical shifts that occurred at the outbreak of the American Civil War. Small, workshop-level alterations often tell larger stories about logistical pressures, innovation, and battlefield necessity. The HARPERS FERRY RARE BUTTERFIELD CONVERSION OF 1816 HARPERS FERRY MUSKET sits at that intersection of industrial history and practical conversion work.

This example is an unmistakable artifact: converted in 1861 from an 1836 Harpers Ferry Model 1816 musket, it features the Butterfield pellet primer system. If you are researching single-shot smoothbore arms or assembling a museum-grade collection, this 42″ round smooth bore .69 caliber musket — one of roughly 200 known Butterfield conversions — is a rare find. Shop this product on our site; the product page links to the retailer where you can complete a purchase.

Historical and Technical Overview

The conversion is documented by markings: the barrel stamped “Butterfields/PHILADA,” the lock plate reading “Butterfield’s/Patent Dec. 11, 1855/Philada,” and the rear of the hammer marked “Harpers/Ferry/1836.” These stamps authenticate the timeline — original Harpers Ferry manufacture in 1836 and a patent-era Butterfield modification during the Civil War. The pellet primer system was an intermediary ignition upgrade intended to improve ignition reliability over traditional flintlock firing in field conditions.

Physical Condition and Collectability

Metal components show a smooth grey patina with pin-prick oxidation consistent with age; the stock retains fine grain with minor nicks and raised grain areas. As a single-shot, .69 caliber round smooth bore, its ballistic profile favors short-range volley fire consistent with early 19th-century doctrine. Price is listed at $8500.99, reflecting rarity, documented conversion, and overall condition within the Single Shot category. View product details and pricing on the shop page to confirm current availability and purchasing steps.

Tactical and Curatorial Notes

From a tactical-historical perspective, the Butterfield system represents transitional technology between flintlock and more modern percussion systems. For curators, provenance markers and stamping are critical; this piece carries clear manufacturer and conversion stamps, making it suitable for interpretive exhibits or serious private collections. The musket’s .69 caliber and 42″ barrel establish it as a true Model 1816 form factor, even after conversion.

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