The Model 1840 flintlock musket was produced at Springfield Armory. The .69 caliber musket had a 42" barrel, an overall length of 58", and a weight of 9.8 lbs. More than 30,000 were produced by the Springfield Armory and two independent contractors between 1840 and 1846.The Model 1840 was a minor improvement over the Springfield Model 1835 musket, and therefore was not dramatically different from the older Model 1835.