The composition of gun metal is:

CONCEPT:

Gun Metal Composition

• Gun metal, also known as red brass in the United States, is a type of bronze – an alloy of copper, tin, and zinc.
• The typical composition of gun metal is:
  • Copper (Cu): Approximately 88%
  • Tin (Sn): Approximately 8%
  • Zinc (Zn): Approximately 4%

EXPLANATION:

• The primary components of gun metal are copper (Cu), tin (Sn), and zinc (Zn).
• Other options include different metals which are not typical components of gun metal:
  • Option 2: Al, Mg, Mn, Cu – This is not gun metal.
  • Option 3: Cu, Ni, Fe – This is not gun metal.
  • Option 4: Cu, Sn, Fe – This is not gun metal.

CONCLUSION:

The correct composition of gun metal includes copper (Cu), tin (Sn), and zinc (Zn).