Brownells 75th Anniversary - A Shooting Heritage

Factory Specified Size Measures M16/AR-15 Maximum Headspace

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.

AR-15, Issue:11, Page:082
AR-15, Issue:11, Page:083
AR-15, Issue:11, Page:087
Big Book Catalog, Issue:70, Page:082
Big Book Catalog, Issue:70, Page:083
Big Book Catalog, Issue:70, Page:085

SPECS: Hardened and ground steel. 1.65" (4.2cm) overall (this is NOT the "headspace" dimension). .3655" (9.3mm) diameter.

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Cartridge: 5.56 mm NATO

Style: Field Gauge