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From Forster, and Exclusive to Brownells, we have the 5.56 Armorers Headspace Gauge Kit! This kit contains one 1.4646” 5.56 Go Gauge, one 1.4686” midrange gauge, and one 1.4736” max field gauge!
These gauges are manufactured by Forster with a reduced rim and cut out for the ejector. This allows the use of the gauge without the disassembly of the bolt.