The 5.56 Armorer's headspace gauge kit, exclusively available from Brownells and manufactured by Forster, includes a 1.4646 inches 5.56 Go Gauge, a 1.4686 inches midrange gauge and a 1.4736 inches max field gauge. These gauges are designed with a reduced rim and a cutout for the ejector, enabling their use without requiring bolt disassembly.

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