Battles & Wars › Revolutions & Napoleon › Interchangeable parts and the American armory system
Springfield Armory
arms depot 1777; armory 1794–1968· Arms maker, factory or program· Arms makers & war industry
Well documentedSolid records, physical evidence or scientific consensus.
The US government's main gun factory for nearly two centuries, in Springfield, Massachusetts, and a birthplace of mass production.
See it on the Battles & Wars map →What happened
George Washington and Henry Knox chose a hilltop above the Connecticut River for an arms depot in 1777. Rebels in Shays' Rebellion tried to seize it in 1787 and were driven off by cannon fire. Made a national armory in 1794, it built its first muskets in 1795. Superintendent Roswell Lee (1815–33) brought division of labor, gauges and strict accounting. It made roughly 800,000 rifled muskets in the Civil War, later the M1903 and M1 Garand rifles. It closed in 1968.
Why it matters
With Harpers Ferry it developed the machine-made, interchangeable-parts methods of the 'American system', which fed later US industry. It armed American soldiers from 1795 into the 1960s.
How we know
Armory records in the National Archives, and the Springfield Armory National Historic Site, a museum holding a huge collection of US military firearms.
Still debated
Civil War production totals differ between sources, depending on which models and years are counted.
Connections (3)
▸Springfield Armory pioneered, with Harpers Ferry, Interchangeable parts and the American armory systemWell documented
The connection
Springfield and Harpers Ferry, the two national armories, were run by the Army's Ordnance Department, which paid for decades of experiment. Springfield developed machine tools such as Thomas Blanchard's lathe for copying gunstocks (about 1820), while Harpers Ferry produced John Hall's interchangeable rifles. The Model 1842 musket was made with interchangeable parts at both.
When and how
Springfield, Massachusetts, and Harpers Ferry, Virginia, about 1815–1850; superintendent Roswell Lee, inventor Thomas Blanchard and John Hall.
How we know
Armory and Ordnance Department records, studied by historians such as Merritt Roe Smith and David Hounshell, and surviving guns.
Debates and open questions
How to divide credit among the armories, private contractors and individual inventors is still debated.
▸Springfield Armory began as an arms depot during the American Revolutionary WarWell documented
The connection
In 1777 Washington's artillery chief Henry Knox chose Springfield, safely inland on the Connecticut River, for an arsenal. It stored muskets and powder, made cartridges and gun carriages, and repaired arms for the Continental Army. Many of the army's muskets, however, came from France.
When and how
Springfield, Massachusetts, 1777–83; Henry Knox and George Washington, with the Continental Army's ordnance staff.
How we know
Continental Army correspondence and the arsenal's records, preserved and interpreted at today's national historic site.
Debates and open questions
How much the arsenal actually supplied during the war is poorly recorded; its output was modest beside French imports.
▸Springfield Armory mass-produced rifles firing the Minié ball and the rifled musketWell documented
The connection
After testing, the US adopted the .58-caliber Model 1855 rifled musket, firing a simplified Minié bullet designed at Harpers Ferry by James Burton. Springfield then built the Model 1861 and 1863 rifled muskets, the Union's main infantry weapons, making roughly 800,000 during the war while contractors copied its patterns.
When and how
Springfield, Massachusetts, 1855–65; the Model 1855, 1861 and 1863 rifled muskets; Harpers Ferry until its destruction in April 1861.
How we know
Ordnance Department production records, surviving rifles marked 'Springfield', and Minié bullets of that pattern dug from battlefields.
Debates and open questions
Burton's hollow-base bullet differed from Minié's own; how much credit each deserves, and exact production totals, vary by source.