Bofors 40 mm - air-cooled gun barrels (20pcs) - used on many ships (HMS Roberts and many more) - in 1/350 scale (stock photos) -

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.