The Springfield Model 1861 is a muzzle-loading rifle that was widely used during the American Civil War. It is a .58 caliber weapon, known for its accuracy and range, making it a favored choice among Union soldiers. The rifle features a rifled barrel, which enhances its projectile stability and effectiveness in battle. Manufactured at the Springfield Armory, the Model 1861 was produced in large quantities, with over 1 million units made. Its design influenced many subsequent firearms, and it played a significant role in military history, marking a transition from smoothbore muskets to more advanced rifled weapons.