The set includes turned brass barrels. One of the most popular modern naval guns ever produced:
USN: Oliver Hazard Perry class
Italy: Animoso and Audace
Royal Netherlands Navy: M-class frigates
Canada: Tribal class
And many more (Used by fifty nations)
The set includes turned brass barrels. It is very simple to use in Your model, and makes it extremely realistic. Simply cut off the original plastic barrel and drill a hole in the remaining part and insert the metal barrel using Cyanoacrylate adhesives.