If you mean what type of steel are guns made from, it depends. Some cheap guns aren't even made from steel, but instead some sort of cheap pot metal.
Steel, aluminum, titanium to name a few.
Iron or steel.
It's very common for a lot of European guns to have Krupp barrels. German guns of course used a lot of Krupp steel and would be the most common makers to use Krupp steel, but you'll also find Krupp steel used in barrels of Austrian and Belgian guns and others. There were even a few U.S. makers who at times used Krupp steel barrels. The three rings are a trademark of Krupp.
Type your answer here... Guns, germs, and steel
Long guns and hand guns
hand guns , long guns, Air guns , Rifle these are used as a firearms .
Its about alot of things
Muskets were the type of guns used in 1690. Pistols were also common types of guns that were used in 1690.
The most highly recommended type of binding wire used to bind steel is stainless steel binding wire. Annealed steel wires and galvanized steel wire can be used as well.
C-Mn steel
steel
Flintlock muskets