Eli Whitney was known as the inventor of the cottoin gin (machine to remove the seeds from newly picked cotton). However, he was also one of the first to establish mass production of anything- the muskets made by his company used standardized parts- so hammer from one musket would fit another, a barrel from one would fit any other, etc. Henry Ford, founder of the Ford Motor Company is generally accredited with the assembly line- where each worker added the same part to each vehicle that moved past him on the line. But without the standard parts pioneered by Whitney, Ford could not have created the assembly line- each part would have required hand fitting.
Price guns are factory made, usually pieced together on an assembly line. If you're really curious about the inner workings, you could buy a price tagging gun and take it apart.
The "First model Rifle" was made in 1923. The first gun was around 1947.
Are you asking about the first Gun or Rifle? The first gun was made in 1935 it was part of the 100 series (100, 122, 177) the first rifle was made in 1899 (the St louis)
The first was the gatling gun invented in 1862
China
The first gun was probably made in the 1400,s.
Bamboo and vines. Cannon.
The first were made from bamboo, which is a type of grass.
Gun store, gun show, on line
It was made for marking trees
The .357 Magnum was the first gun to use the term magnum.
Wood