1905 Ross MK II sporter

I would think the number on the barrel is just an assembly number or batch number the upper hand guard would be covering it up so it wouldn't really make sense to have a serial number there plus its stamped fairly haphazardly and from looking it appears the factory sporting rifles had a different barrel profile around the chamber area.

Same profile.
 
Ross MarkII service rifle with factory serial number 466 series P made in 1906 advanced (converted) to Mark II* in April 1910.
Issued to the 108th Cadet Corps rifle # 17. The T in front of the conversion date is probably the M & D location where the work
was performed. One of 19,300 made (if memory serves me). Easy - peasey. JOHN
 
Ross MarkII service rifle with factory serial number 466 series P made in 1906 advanced (converted) to Mark II* in April 1910.
Issued to the 108th Cadet Corps rifle # 17. The T in front of the conversion date is probably the M & D location where the work
was performed. One of 19,300 made (if memory serves me). Easy - peasey. JOHN

Cool, I was wondering what that other stamping signified
 
If anyone's interested I found out what the knurled ring on the rear sight is for. According to the 1907 Ross manual it's called the micrometer thimble and is used for fine adjustment of the rear sight leaf and its graduated in 10 yard increments

1907 Ross manual: The front end of the rear sight base is threaded to engage a ring for fine adjustment. Both its front and rear ends project over the barrel in such a manner that they secure the handguards. Fine adjustment is obtained by the ring already mentioned which is termed the "micrometer thimble." It engages the front ends of the index slides and when revolved gives them a forward or backward movement carrying with them the sight slide and raising or lowering the rear sight leaf. It is graduated in tens from 0 to 100, the even numbers being marked in plain figures and the odd numbers being indieated by a line. These graduations represent a horizontal increase or decrease of ten yards at any range, the curve of the sight leaf giving the extra height of backsight required.* The micrometer is at zero when the 0 rests on the cross line cut on the rear sight base from which position an increase or decrease of 50 yards range can be given. The value of each graduation on a vertical target is roughly 1 inch per 100 yards.
 
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