223 Headspace Gauge GO and NOGO set
The GO gauge is used to measure the minimum allowable, safe chamber headspace.If the bolt does not close on a Go gauge, it is considered unsafe.The NO-GO gauge is used to measure the Maximum recommended chamber headspace. If the bolt closes on a NOGO gauge, it is out of the recomended good condition range, and should then be checked with a Field Gauge to determine if it is still safe headspace. When checking or setting new headspace such as for a rechamber job or matching a new barrel and bolt, the bolt should not close on the NO-GO gauge.  This set can also be used for all rifles with 5.56 NATO chambers as all commercial sold 5.56 chambers are headspaced to 223 so they can safely fire both 223 and 5.56. This gauge set ships only in the USA, No export or APO/FPO.