Remington 30-06 Springfield scope.
About $250 if it is in good shape.
Any scope that you choose to use can be used on your remington model 700.
Remington, from 1963-1987. No longer in production.
Not without modifications
The scope mount for the Remington Model 750 is regularly sold at GunBroker.com.
$50 to $300 depending on condition and demand.
Check the scope mount makers web sites or call Remington.
Yes they are interchangeable. The 580 is a single shot bolt action and the 581 is a clip fed bolt action.
A Bushnell 3-9x40 variable scope
Yes
It is possible but not guaranteed. The Remington 581 and 591M are different models, so there may be slight variations in the stock design that could affect the compatibility. It's best to compare the dimensions and mounting points of the stocks to ensure a proper fit.