Springfield Armory in the context of "Interchangeable parts"

Springfield is the most populous city in Hampden County, Massachusetts, United States, and its county seat. Springfield sits on the eastern bank of the Connecticut River near its confluence with three rivers: the western Westfield River, the eastern Chicopee River, and the eastern Mill River. At the 2020 census, the city's population was 155,929, making it the third most populous city in the U.S. state of Massachusetts and the fourth most populous city in New England after Boston, Worcester, and Providence. Metropolitan Springfield, as one of two metropolitan areas in Massachusetts (the other being Greater Boston), had a population of 699,162 in 2020.

Springfield was founded in 1636, the first Springfield in the New World. In the late 1700s, during the American Revolution, Springfield was designated by George Washington as the site of the Springfield Armory because of its central location. Subsequently it was the site of Shays' Rebellion. The city would also play a pivotal role in the Civil War, as a stop on the Underground Railroad and home of abolitionist John Brown, widely known for his raid on Harpers Ferry, and for the Armory's manufacture of the famed "Springfield rifles" used ubiquitously by Union troops. Closing during the Lyndon B. Johnson administration, today the national park site features the largest collection of historic American firearms in the world.

Shays's Rebellion was an armed uprising in Western Massachusetts and Worcester in response to a debt crisis among the citizenry and in opposition to the state government's increased efforts to collect taxes on both individuals and their trades. The fighting took place in the areas around Springfield during 1786 and 1787. Historically, scholars have argued that the four thousand rebels, called Shaysites, who protested against economic and civil rights injustices by the Massachusetts government were led by Revolutionary War veteran Daniel Shays. By the early 2020s, scholarship has suggested that Shays's role in the protests was significantly and strategically exaggerated by Massachusetts elites, who had a political interest in shifting blame for bad economic conditions away from themselves.

In 1787, the protesters marched on the federal Springfield Armory in an unsuccessful attempt to seize its weaponry and overthrow the government. The federal government, severely limited in its prerogatives under the Articles of Confederation, found itself unable to finance troops to put down the rebellion; it was consequently put down by the Massachusetts State Militia under William Shepard, alongside a privately funded local militia led by former Continental Army officer Benjamin Lincoln. The widely-held view had already developed that the Articles of Confederation were untenable and needed amending, with the events of the rebellion serving as further evidence for the later Constitutional Convention. There is continuing debate among scholars as to what extent the rebellion influenced the later drafting and ratification of the Constitution.

The Springfield Model 1888 was a trapdoor breechblock service rifle produced by the Springfield Armory for the United States military. Introduced in 1888, it was the final design in a long line of such weapons using a design developed by Erskine S. Allin in the 1860s, and the last single-shot rifle to see American military service.

Despite the replacement of the trapdoor rifles by the adoption of newer repeating rifles, they were manufactured until 1893 and saw combat during the Spanish–American War, a combat that was dominated by the newer Springfield Krag–Jørgensen bolt action rifle. The Model 1888, despite its aged technology, was built in large numbers and was also the most advanced and efficient of all the Springfield trapdoor rifles, and for this reason remains popular among military enthusiasts.

The term Springfield rifle may refer to any one of several types of small arms produced by the Springfield Armory in Springfield, Massachusetts, for the United States armed forces.

In modern usage, the term "Springfield rifle" most commonly refers to the Springfield Model 1903 for its use in both World Wars.