Quote Originally Posted by MDriskill View Post

A significant difference in the Victor action was the flat faced rear breech plug, instead of the rounded Vulcan type, also it originally retained the 14mm barrel and short front sight of the Vulcan I.

A notable change in the Vulcan III was the cast trigger blade, which had a wider ribbed face.

The C1 was a straight Victor action with the barrel further shortened, but later versions acquired a safety, 16mm barrel, and ribbed trigger (which IMHO greatly improved the handling of the cute but wrist-wrecking straight grip stock).
Some great extra info for this on-going thread, there, so many thanks. Atb: G.