Used on most of the modern US aircrafts:

F-104, F-105, F-14, F-15, F-16, F-18 and other

The set includes turned brass barrels and etched barrel clamps. 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 plastic parts. Insert the metal barrel using Cyanoacrylate adhesives.