Numerous individuals and companies made them.
No. No one can. There are a lot of custom rifle makers and major gun makers that make rifles chambered in 7x57
Numerous commercial and custom makers have made 8mm Mauser rifles in the last 100 years
K Mart does not make rifles. They contract with makers to have their name put on weapons that they sell.
KMart contracted with various makers. Ruger is one.
Mostly European makers.
Some makers have such a site.
Browning had rifles made by other makers.
Winchester Remington Marlin Savage Colt Ruger
Kmart contracted with many makers. Winchester is one.
Most of the major makers offer one.
There is no one answer, as there is no one gun. There are high dollar makers of custom shotguns and big game rifles, such as Holland & Holland, Merkel, Purdey, etc. There are makers of high quality target rifles, such as Blaser, Anschutz, etc. No one gun, no one answer. Sorry.
Crude cannon? About 1000 years ago. Rifles? Mid 1500s in Europe.