The set includes turned brass late version 20mm Hispano (rounded fairings) and Browning .50cal.
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 and insert the metal barrel using Cyanoacrylate adhesives.
Early version of Spitfire E wing You'll find in our set:
AM-32-081 - Spitfire Mk.IXe/XVIe early version (conical fairings).