The Action of a bolt action rifle is the heart of any rifle. Concentricity starts with every cut on the action being true and concentric to the rifles bore and chamber. We first start with mounting the action in a Greg Tannel action jig in the lathe. Running the mandrel in the bolt raceway absolutely true to the axis of the spindle. After the actions is running true the blue printing process starts. All the cuts that are made to your action are made with it running true to the bolt raceway. Facing the action is the first step then we cut lug abutments, and finally recut a true thread for centering the action thru the chamber concentric of the bore. 2nd piece to true is your bolt. It will be put on center in the lathe. The lugs will be recut and the face of the bolt will be cut square to the actions face.