New Ross MK2, have some questions?

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You have a Ross Mk II***. It was first manufactured as a Mk II**** with a Ross Mk III rear sight. That sight was replaced with the present Canada Tool & Specialty Co. (Sutherland Mk II) sight and the rifle designation changed to Mk II ***. The M.E. Sutherland Sight Co. became the Canada Tool & Specialty Co. That all happened at the factory, and before the rifle left the factory, and the two divots on the under-side of the barrel are remnants of the earlier sight mount.

Your barrel has been set back one turn.

In that case the chamber needed to be reamed to lengthen the chamber back to the correct size !! Why was this done ? Was it to correct chamber problems ? Will a replacement stock need to shorten at the muzzle end to be able to fit a bayonet ?