The bolt on the Mosin-Nagant rotates 90°. In the open position, the bolt handle points straight up. Mounting a scope directly over the bore is not possible, unless the bolt handle is modified.
There is no "traditionnal" safety switch on this rifle. Rather pull back on the cocking piece and rotate it counter-clockwise 45 degrees (picture on the right).
Very similar to the Mauser, the rear sight is a ladder, with graduations from 100 to a very optimistic 2000 meters (!).
The front sight is a fixed post. It cannot be moved or ajusted. It is also quite fragile.