Has anyone seen a MkI barrel fitted with a Mk2 gas block and cone "flash hider"?

I recently had one pass thru my hands and took a few (poor quality) pictures.

Are they common, or was this a "One-off"?

I initially thought that it was some home brew "lightened" MkII barrel, until I remembered the picture of the MkI barrel with flash hider removed:

Milsurps Knowledge Library - The Mk1 and Mk1* Bren Barrel (by Peter Laidler))

The give-away for me was the standard Mk2 flash hider with it's 2 positioning keys proud of the barrel thickness.
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