First, a family photo:
A comparison of the Mark VI with the Mark IV along with boxes of WWII-dated ammunition. The similarities are obvious but the Mark IV has a number of improvements over the older pistol. The Mark VI is chambered in .455 Webley while the smaller Mark IV is chambered in .380 Revolver which can be interchanged with .38 S&W.
Left side of the Mark IV. Notice the holster guides (the wedge-shaped piece ahead of the cylinder) which are fixed to the barrel. The cylinder cam is a separate piece mounted below the holster guides.
The firing pin is machined into the face of the Mark VI's hammer.
The Webley Mark IV's cylinder cam and holster guides are one piece which are mounted to the barrel assembly. The cylinder cam lever screw has a much smaller slot compared to the Mark VI. The large slot was intended to allow soldiers to use a coin to field strip the pistol.
The Mark IV has a pivoting firing pin mounted to the hammer's face. This allows a more direct primer hit rather than the slightly oblique strike from the older revolver. The front sight is fixed to the barrel on the Mark IV where it was removable on the Mark VI.
The the barrel hinge pin screws are identical on this revolver, where the left side screw is larger on the Mark VI.
The Mark IV's grips also have the unmistakable "Webley" logo. Note the 'WAR FINISH' stamp on this side of the revolver. This was done as measure to prevent possible customers from being too disappointed in the company based on their wartime production.
The recoil plate, cylinder bolt and cylinder stop of the Mark VI.
These parts on the Mark IV are similar, just scaled down for the smaller pistol.
This is the recoil plate, pawl and cylinder bolt of the No2 MkI Enfield. The Enfield design omits the cylinder stop which is integral to the Webley trigger design. This is the reason for the 'gutters' on the rear edge of Webley cylinders.
