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- GO: Corresponds to the minimum chamber dimensions. If a rifle closes on a GO gauge, the chamber will accept ammunition that is made to SAAMI’s maximum specifications. The GO gauge is essential for checking a newly-reamed chamber in order to ensure a tight, accurate and safe chamber that will accept SAAMI maximum ammo. Although the GO gauge is necessary for a gunsmith or armorer, it usually has fewer applications for the collector or surplus firearms purchaser.
- NO-GO: Corresponds to the maximum headspace Forster recommends for gunsmiths chambering new, bolt action rifles. This is NOT a SAAMI-maximum measurement. If a rifle closes on a NO-GO gauge, it may still be within SAAMI specifications or it may have excessive headspace. To determine if there is excessive headspace, the chamber should then be checked with a FIELD gauge. The NO-GO gauge is a valuable tool for checking a newly-reamed chamber in order to ensure a tight and accurate chamber.
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Reviews
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8.6 BLK GO/NO GO GAUGE SET
Excellent gauges. They do exactly what they are supposed to do.
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8.6BO Go/NoGo Gauges
What’s there to say? Gauges that are essential for the home assembler.
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8.6 BLK GO/NO GO GAUGE SET
Well-constructed at a good price!
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8.6 go/ nogo guages
They are made of quality material and worked great for me.