The BOLT LAPPING TOOLS by BROWNELLS are designed to provide constant, straight-back pressure for squaring bolt lugs against the receiver during lapping.
Interchangeable threaded sleeves are available to fit a variety of actions, including specific models for Savage Arms and Mauser large and small ring actions.
The product includes a spring-loaded tool, plunger, and the appropriate sleeve for the action, with special sets available for M14/M1A and Mauser rifles.