Master Model produces finely crafted small detail parts for models which have been damaged or may be subject to rough handling. Their collection of antennas and pitot tubes are invaluable for the modeler whose friends (or former friends) handle models less than carefully. There’s a picture below. This particular set is the guns for a Spitfire IXe.
The Spitfire IXe had a pair of 20mm cannons in the wing. These had been moved outboard to allow more ammunition for the Browning .50 caliber machine guns. The cannons stuck pretty far out from the wing, but the Brownings barely showed. The “fix” for the Brownings was to put the muzzle inside a tube which extended from the wing.