Brownells Brownells 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:10, Page:078
AR-15, Issue:10, Page:079
AR-15, Issue:10, Page:082
Big Book Catalog, Issue:67, Page:078
Big Book Catalog, Issue:67, Page:083
Law Enforcement / Police Store, Issue:08, Page:054

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


Out of Stock

Cartridge: 5.56 mm NATO

Style: Field Gauge