Longbranch No4 Mark I* 6 groove barrell

[Maygyver]

I have a No 4 Mk I* that went through an apparent arsenal rebuild in 1950. The rifle has matching bolt and receiver serial numbers, I've found the LB stamp on everyting but the trigger which is marked with a square shouldered 'S' (savage?). Both the receiver and the barrel have the Canadian acceptance stamp of the 'C' around a broad arrow. The barrell is blued, the receiver is parkerized, all the other parts appear to be blued. The odd part about the barrell is that it has 6 grooves instead of the 2 or 5 grooves that appears to be standard. I've attached images of the bore and the barrell markings. Does anyone have any insight on the 6 groove barrell? The flat on the top of the barrell is stamped 'CMK4' and there is a small diamond stamped about halfway to the muzzle.

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