What are these holes for?

[codybrown]

Just bought a Jarrett rifle built on a 700 action. It has 2 holes drilled on the back on the action on either side of the rear base. Look like they're about 4-40 thread size. Only 1 has a screw in it. What are they for?

 

[codybrown]

Pics

 

[std7mag]

Maybe fastening a fixture to install the action on a lathe?
I've seen fixtures that replace the bolt, so the machining is done true to the centerline of the action, not the outside.

But that's just a guess.

 

[Dusty Stevens]

If it has nylon tips on the screws its to keep the bolt from lifting in the raceway.

 

[mike mccormick]

Those are set screws to control bolt deflection caused by the trigger cocking piece.