BROWNELLS FIRING PIN PROTRUSION GAUGE FOR AR-15/M16

The Brownells Firing Pin Protrusion Gauge for AR-15/M16 is a simple but critical diagnostic tool designed to verify proper firing pin protrusion in AR-platform rifles. Correct firing pin protrusion is essential for reliable ignition and safe firearm operation. Insufficient protrusion can lead to light primer strikes and misfires, while excessive protrusion may cause pierced primers and potentially unsafe operating conditions.

Designed specifically for the AR-15 and M16 bolt assembly, this precision gauge allows armorers, gunsmiths, and firearm builders to quickly determine whether a firing pin falls within the acceptable operating range. It is particularly useful when assembling a new bolt carrier group, troubleshooting ignition issues, or inspecting heavily used service rifles.

Constructed from durable steel and compact enough to fit easily into any armorer's kit, this gauge provides a fast and reliable method for confirming proper firing pin function.

FEATURES

• Measures firing pin protrusion on AR-15 and M16 bolt assemblies
• Helps diagnose ignition and primer-related issues
• Verifies firing pin protrusion falls within acceptable specifications
• Detects conditions that may cause misfires or pierced primers
• Quick and easy to use during assembly, inspection, or maintenance
• Precision steel construction
• Compact size fits easily in an armorer's toolkit
• Ideal for gunsmiths, armorers, and AR builders

SPECIFICATIONS

• Manufacturer: Brownells
• Application: AR-15/M16
• Material: Steel
• Overall Length: 2" (5.1 cm)
• Width: 1/4" (6.3 mm)
• Minimum Protrusion: .028"
• Maximum Protrusion: .036"

CUSTOMER INSIGHTS

AR builders and armorers often consider firing pin protrusion one of the most overlooked measurements in bolt inspection. Customers appreciate having a dedicated gauge that quickly confirms a firing pin is within specification, eliminating guesswork during troubleshooting. Many users keep this gauge alongside headspace gauges as part of a complete AR inspection and maintenance toolkit, particularly for high-round-count rifles, duty carbines, and newly assembled builds.

The Brownells Firing Pin Protrusion Gauge for AR-15/M16 provides a fast, accurate method for verifying firing pin protrusion within the recommended range of .028" to .036". Built from durable steel and designed specifically for AR-platform rifles, it helps prevent misfires, pierced primers, and other ignition-related issues, making it an essential tool for builders, armorers, and professional gunsmiths.