I, too, find that the photos....... uh...... "lack definition", to the point that accurate replies are compromised more than a bit.
The close-up which begins the thread shows a Bolt which is assembled CORRECTLY.
OP: do yourself a really HUGE favour and read the Stickie. This rifle has the 1910 Ross action, the strongest ever made, but it COULD be assembled in a dangerous condition. This one is okay right now, but DO be careful if you remove the Bolt any time. You MUST have that inch of clearance between the Bolt Sleeve and the Locking Lugs, else the Lugs cannot rotate in order to lock up.
You think the rifle is accurate now? It will be TWICE as accurate with the proper rear-sight assembled. You need a complete Mlitary-type Receiver Bridge for a Mark III Ross Rifle, with the Ross Battle Aperture Sight and you need the 4 tiny screws with which to mount it. The Screws are a standard thread; all Ross screws were to US standards: no oddball threads. This sight is fully adjustable for shooting with military ammunition but it also may be used for commercial ammo AND it is fully adjustable for wind!
The Rifle looks to me like one of the ones which our guys took overseas during the First World War, turned in for a Lee-Enfield, the Rosses going to the Royal Navy and the Royal Marines. Some were surplussed as late as the 1950s and rebuilt into excellent Sporters in British shops, into the 1960s. The heavy Barrel is very much the giveaway for the sportered Military Ross: the commercial Factory Sporters had long, slnder, lightweight barrels. These sportered Military rifles are a pound heavier but they can be made to shoot exceptionally accurately.
BTW guys, listen to TIRIAQ when he speaks. He will NOT give you bad information and he is generally bang-on. I TRY not to give bad information, but I don't know everything. (Yet!)
These are truly great rifles, even though the last one was made 96 years ago. They deserve MUCH better than most people give them.
Hope this helps.