Used on Polish destroyers Grom and Blyskawica (before rearmed in 1941) (Mirage Hobby models). Used also on Polish Minelayer Gryf
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.