I picked up a No. 4T non matching scope to rifle with Indian markings here on the EE 2yrs ago. Nobody wanted it because it was used by India (seems nobody reads WW2 history like the battle of Monte Cassino) and when his price went below 3k I contacted him and set up a meeting. The rifle was fully legit and the scope and bore were all excellent. The rifle is very accurate and I got a chance to fire it at 800m at Connaught Ranges and hit the 4ft with it. People do pay a premium for matching scope to rifle, and more if it's Canadian issue. The accessories are a nice touch. I think Marstar's prices are that high because he can keep it on his website for years until someone rich enough or impatient enough will pay that much for it. 5-6k seems about right.
I sold one of those to a friend here, 303t. It was a very decent example, complete with chest, scope can and a MkI scope.
Those rifles have a very interesting history. In 1945 to 1950, the UK started to sell off the No4 MkI Ts they considered to be surplus. Of course, they sold off the rifles fitted with mismathched serials, mounts and scopes first. India bought most of them. In India, they were FTred and had the Ishy screw installed. The MkI scopes were all taken apart and refurbished as well. New lenses and waterproofed. The unit I had was rebarreled as well. The stocks, were rough sanded in line with the grain and oiled, to cut down on glare.
The Indian armed forces took very good care of their T rifles. They didn't have a lot of them and valued them highly. When they ran out of proper parts, they cannibalized lesser rifles to keep the better quality specimens running.
When the armed forces of India no longer had enough functional Ts to meet their needs, they transferred them to their various police forces. Again, they were well taken care of and highly desired. To my knowledge, some of the rural police still use the No4T for sniping purposes. About 1993, International Firearms in Montreal received 15 of them. They never even bothered to advertise them. They just informed a few people they knew would snap them up.
Don't let anyone tell you the Indian No4 T rifles are substandard. They don't know what they are talking about.