Home / Gunsmith Tools & Supplies / Brownells / 5.56mm Maximum Headspace Gauge - Brn Ar-15/M16 Colt 5.56x45 Nato Headspace Gauge 1.4736''''
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5.56mm Maximum Headspace Gauge - Brn Ar-15/M16 Colt 5.56x45 Nato Headspace Gauge 1.4736''''
Lowest Listed Price
$37.16
MSRP
$37.16
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1 Stores
Updated
Aug 26, 2026
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Specifications
Brand
UPC
757253992421
Description
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. Mfg: Brownells SPECS: Hardened and ground steel. 1.65" (4.2cm) overall (this is NOT the "headspace" dimension). .3655" (9.3mm) diameter.
