All 591 actions come with a integral .250” recoil lug and 20 MOA 1913 picatinny rail that runs the full length of the action, as well as a side mounted bolt stop that is shrouded to help prevent accidental releasing of the bolt.
In the middle of the left bolt raceway is an anti-jam rail, the purpose of this rail is to prevent a round from lodging in the raceway when single loading the rifle through the ejection/loading port.
The raceway on the right hand side has an anti-bind rail just below the ejection/loading port, the purpose of this rail is to insure smooth bolt operation as the locking lug passes through the loading port.
The 591 will work in conjunction with any stocks made for the Remington 700 short action with little to no modification as well as triggers and feeding systems.