What Do I Have?

[RossMkIIEnjoyer]

I bought this receiver on a whim. The receiver is drilled and tapped and it looks to me that its for the bridge with Ross battle sight like the Mk II** has. I am going off example 18 on page 14 of Sir Charles Ross and His Rifle. The barrel doesn't look particularly heavier than the Mk II*** I own and appears to have formerly had a barrel mounted rear sight. This barrel was not installed in the receiver when I bought them so I suppose there is a possibility that they aren't from the same rifle. Maybe someone installed a rear bridge on a Mk II*** which seems much more common. Any way to tell?
Thanks.

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