FORSTER - Essential AR-15 223/5.56 Headspace Gauge Set

BROWNELLS ESSENTIAL AR-15 .223/5.56 HEADSPACE GAUGE SET

The Brownells Essential AR-15 .223/5.56 Headspace Gauge Set provides AR builders, gunsmiths, and armorers with the critical gauges needed to verify safe and proper chamber headspace in AR-15 rifles chambered in .223 Remington and 5.56 NATO. Whether assembling a new rifle, installing a replacement barrel, or evaluating a used firearm, this gauge set helps confirm that chamber dimensions fall within safe operating tolerances.

Proper headspace is one of the most important factors affecting firearm safety, reliability, and performance. This kit simplifies the inspection process by providing the gauges required to check chamber dimensions and identify potential issues before they become problems. Compact and easy to use, it is an essential addition to any AR-15 armorer's bench.

FEATURES

• Designed specifically for AR-15 rifles
• Compatible with .223 Remington and 5.56 NATO chambers
• Allows verification of proper chamber headspace
• Ideal for AR builders, gunsmiths, and armorers
• Useful for barrel installation and replacement projects
• Helps identify excessive or insufficient headspace
• Supports routine firearm inspection and maintenance
• Precision-machined steel gauge construction
• Compact kit for workshop or armory use
• Essential safety and diagnostic tool for AR-platform rifles

SPECS

• Brand: Brownells
• Platform Compatibility: AR-15
• Compatible Cartridges: .223 Remington, 5.56 NATO
• Dimensions:
  • No Gauge 223 – 1.4636"
  • No Go Gauge 223 – 1.4666"
  • Field Gauge II – 1.4736”
  • Go Gauge 5.56 - 1.4646”
• Application: Headspace Inspection and Chamber Verification
• Material: Steel
• Gauge Type: Headspace Gauges

INCLUDED

• .223/5.56 GO Gauge
• .223/5.56 NO-GO Gauge
• Protective Storage Case

CUSTOMER INSIGHTS

AR-15 builders appreciate having a dedicated headspace gauge set available when installing barrels or assembling rifles from components. Many users consider headspace verification a critical final step before firing a newly built rifle, while armorers value the ability to quickly inspect rifles during maintenance and troubleshooting. The compact nature of the kit makes it a practical addition to any AR-specific tool collection.

The Brownells Essential AR-15 .223/5.56 Headspace Gauge Set provides the fundamental tools needed to verify safe chamber dimensions in AR-15 rifles chambered in .223 Remington and 5.56 NATO. Featuring precision steel GO and NO-GO gauges, this kit helps ensure proper headspace during rifle assembly, barrel installation, inspection, and maintenance.

See all of our AR15s and AR15 parts here.