6.5 Creedmoor Match No-go Gauge
The "NO GO" gauge is used to make sure a firearm does not have excessive headspace. The bolt should NOT fully close on the "NO GO" gauge, if the bolt cannot be closed on the "NO GO" gauge then you know your rifle does not have headspace that is excessive. The "NO GO" gauge can be thought of as a maximum headspace gauge and should not be able to fit in the rifle's chamber with the bolt fully closed.
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