A NOGO gauge is a tool used to check for excessive headspace in a rifle chamber. If a rifle closes on a NOGO gauge, it may indicate that the headspace is beyond the safe limit. This is a critical check for gunsmiths and firearm enthusiasts to ensure that the rifle is safe to use. Regular checks with a headspace gauge can prevent potential accidents and maintain the firearm's performance.

• Extensive range of rimless gauges in large calibers
• Engineered from premium-grade, hardened steel and meticulously precision-ground to meet stringent ANSI and SAAMI specifications
• The headspace tolerance is precisely ground to an exacting specification of +/-0.00015 inches
• Each headspace gauge is meticulously inspected using NIST-certified measurement instruments