This service prepares a rifle action for precision barrel installation by correcting minor variations and imperfections in Winchester's production machine work. The blueprinted action is smother and more precise than is possible using Winchester production tolerances, which can deviate from nominal by several thousandths of an inch. In a blueprinted action, the machined portions of the action which are centerlined on, concentric to, or perpendicular to the bolt bore are all trued to this axial centerline. When the barrel is installed, this ensures the bore and chamber are also properly aligned to the axial centerline of the bolt.
Blueprinting is accomplished by establishing the true centerline of the receiver bolt bore and then truing all other critical surfaces of the action to this centerline. The blueprint process is completed in a lathe with precision tooling and fixtures, and can set the machined tolerances of the receiver and bolt to within +/- 0.0001"
Blueprinting includes the following machine work and services:
Re-cutting and truing of the receiver barrel threads
Re-cutting and truing of the receiver bolt lugs
Re-cutting and truing of the receiver face
Lapping of the bolt lugs to the receiver lugs
Re-cutting and truing of the bolt face
Finish restoration of all surfaces
This service can be added to any action purchase, or can be purchased as a stand-alone item, if you wish to send in your action for blueprinting.