The throat diameter range for achieving maximum accuracy is extremely narrow, specifically at 0.004 inches. Deviating from this range, either smaller or larger, will result in reduced accuracy. By inserting the plug gauge into the barrel throat, users can quickly determine when they are nearing the correct diameter. This tool provides a warning before exceeding the optimal range. Additionally, it serves as a valuable diagnostic instrument for firearms with reported accuracy issues. It is designed for chamfers cut with our tools and may not provide accurate readings on firearms with different chamfer angles. Each gauge is self-piloted, precision-ground, hardened and stepped to indicate both the minimum and maximum optimal diameters.

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It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

WARNING: Handling firearms or firearms parts can expose you to lead and other petroleum products known to the State of California to cause cancer, birth defects, or other reproductive harm. Wash hands thoroughly after handling. For more information go to www.p65warnings.ca.gov (CA Health and Safety Code Section 25249.6).