Brownells Colt Field 5.56x45mm Maximum Headspace Gauge 1.4736
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Made
to the Colt factory's special dimensions for M16/AR-15 rifles. It
measures the maximum factory acceptable headspace; an essential check on
guns that have seen extensive service or have been rebarreled.
Headspace measurement: 1.4736 Max
SPECS: Hardened and ground steel. 1.65" (4.2cm) overall (this is NOT the "headspace" dimension). .3655" (9.3mm) diameter.
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