In the age of the internet a simple search with terms like "Ross Rifle" or "Ross Rifle parts" will turn up various dealers. Including your address, if you are into bricks and mortar stores to shop at will find local dealers.
Ross rifle was created in 1903.
Canada
What on earth is an "encampment"? A 1916 Ross MkIII rifle in original condition, still showing both the Regimental markings and the Ross-applied serial on the buttstock, with some original finish on the steel parts should sell for around $900-$1000 CAD or USD-
ross rifle
Sir Charles Henry Augustus Frederick Lockhart Ross
Ask a gunsmith for help.
bro
Sam Hughes supported the Ross Rifle, which turned out to be faulty when used in WW1. Hughes was at the time Minister of Militia.
The Ross Rifle was used by Canadians in world war one. WW1 was mainly trench warfare and were not good conditions for the Ross rifle it would jam fairly easily and Canadian soldiers were forced to pick up dead Germans guns the Lee-Enfield
This was a straight pull bolt action .303 rifle issued to the Canadian military starting in 1903. It had some problems. See the link below for an article on the Ross.
Do a search for High Standard A1041 rifle parts. Numrich gun parts has a good selection of parts for this rifle.
You take it to a gunsmith.