Question: What type of metal are guns made of?

Disambiguated questions and answers:
context: A gun barrel is a crucial part of gun-type ranged weapons such as small firearms, artillery pieces and air guns. It is the straight shooting tube, usually made of rigid high-strength metal, through which a contained rapid expansion of high-pressure gas(es) is introduced (via propellant combustion or mechanical compression) behind a projectile in order to propel it out of the front end (muzzle) at a high velocity. The hollow interior of the barrel is called the bore, and the diameter of the bore is called its caliber, usually measured in inches or millimetres.
question: What type of metal are gun barrels usually made of?
short_answers: rigid high-strength metal
wikipage: Gun barrel

context: Gun barrels are usually metal. However, the early Chinese, the inventors of gunpowder, used bamboo, which has a strong, naturally tubular stalk and is cheaper to obtain and process, as the first barrels in gunpowder projectile weapons such as the fire lances. The Chinese were also the first to master cast-iron cannon barrels, and used the technology to make the earliest infantry firearms — the hand cannons. Early European guns were made of wrought iron, usually with several strengthening bands of the metal wrapped around circular wrought iron rings and then welded into a hollow cylinder. Bronze and brass were favoured by gunsmiths, largely because of their ease of casting and their resistance to the corrosive effects of the combustion of gunpowder or salt water when used on naval vessels.
question: What type of metal are early european guns made of?
short_answers: wrought iron
wikipage: Gun barrel

context: Gun barrels are usually metal. However, the early Chinese, the inventors of gunpowder, used bamboo, which has a strong, naturally tubular stalk and is cheaper to obtain and process, as the first barrels in gunpowder projectile weapons such as the fire lances. The Chinese were also the first to master cast-iron cannon barrels, and used the technology to make the earliest infantry firearms — the hand cannons. Early European guns were made of wrought iron, usually with several strengthening bands of the metal wrapped around circular wrought iron rings and then welded into a hollow cylinder. Bronze and brass were favoured by gunsmiths, largely because of their ease of casting and their resistance to the corrosive effects of the combustion of gunpowder or salt water when used on naval vessels.
question: What type of metal were guns made of, favored by gunsmiths?
short_answers: Bronze and brass

brass

Bronze
wikipage: Gun barrel

context: Gun metal, also known as red brass in the United States, is a type of bronze – an alloy of copper, tin, and zinc. Proportions vary but 88% copper, 8–10% tin, and 2–4% zinc is an approximation. Originally used chiefly for making guns, it has largely been replaced by steel. Gunmetal, which casts and machines well and is resistant to corrosion from steam and salt water, is used to make steam and hydraulic castings, valves, gears, statues, and various small objects, such as buttons. It has a tensile strength of 221 to 310 MPa, a specific gravity of 8.7, a Brinell hardness of 65 to 74, and a melting point of around 1,000 degrees Celsius.
question: What type of metal was chiefly used for making are guns in the past?
short_answers: Gun metal

red brass

gunmetal

88% copper, 8–10% tin, and 2–4% zinc
wikipage: Gunmetal

context: Gun metal, also known as red brass in the United States, is a type of bronze – an alloy of copper, tin, and zinc. Proportions vary but 88% copper, 8–10% tin, and 2–4% zinc is an approximation. Originally used chiefly for making guns, it has largely been replaced by steel. Gunmetal, which casts and machines well and is resistant to corrosion from steam and salt water, is used to make steam and hydraulic castings, valves, gears, statues, and various small objects, such as buttons. It has a tensile strength of 221 to 310 MPa, a specific gravity of 8.7, a Brinell hardness of 65 to 74, and a melting point of around 1,000 degrees Celsius.
question: What type of metal are guns made of, replacing gun metal?
short_answers: steel
wikipage: Gunmetal

Long answers:
long_answer: Guns have been made of several types of metal, including steel, bronze, brass, wrought iron, and gun metal. Guns are made of steel, which replaced gun metal, while guns' barrels are usually made of rigid high-strength metal. In the past, guns were chiefly made with gun metal, an alloy of copper, tin, and zinc. They were also made of bronze and brass, which was favored by gunsmiths, while early European guns were made of wrought iron.