Vektor Super Kriss
 

http://1.bp.blogspot.com/-e9dPnCoZGB...00/322+(2).jpg

Anyone any idea how many rounds in it could be in this twin-box.......even though it looks photoshopped

That would be 100 rds, but I don't think the Beta C-Mag comes in .45 ACP at the moment, so most likely Photoshop as you said.

It's a Photoshop job of a 100 round Beta C-mag in 5.56mmattached to a Kriss Vector.

http://www.betaco.com/#

Definitely Photoshop. The focus on the C-Mag and the Kriss are different.

would still be cool as a weapon for a player character

If they'd used the 9X19 C-Mag variants it would look more believable.