The Surgeon 591 action is a popular choice for custom gun builders. A one piece bolt, integrated rail and recoil lug provide an excellent foundation for custom rifles.
This particular action has a 308 bolt face and is going to be used in an upcoming 6.5 Creedmoor post.
Here are the specifications from Surgeon:
591 SHORT ACTIONS
All 591 actions are built with an integral .250” recoil lug and 20 MOA 1913 picatinny rail that runs the full length of the action. A shrouded, side mounted bolt stop is integrated 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 591SA 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.
I took some photos of it to share. Note the extractor, ejector, and firing pin assembly are removed.