The AR-15 platform's popularity stems from its modularity and adaptability. However, this very adaptability necessitates regular checks to ensure proper function and, critically, safety. One crucial tool for maintaining your AR-15's reliability is the AR-15 go/no-go gauge. This simple yet essential tool allows you to verify the headspace of your rifle's chamber, preventing potentially catastrophic malfunctions. This article will delve into the importance of go/no-go gauges, how to use them, and why they are an indispensable part of responsible AR-15 ownership.
Understanding Headspace in Your AR-15
Headspace refers to the distance between the bolt face and the breech face of the barrel. Proper headspace is crucial for safe and reliable operation. If the headspace is too short (short headspace), the cartridge may not fully chamber, leading to malfunctions. More dangerously, if the headspace is too long (excessive headspace), the cartridge case can rupture upon firing, causing serious injury or damage to the weapon.
Why is accurate headspace essential?
- Safety: Incorrect headspace is the leading cause of catastrophic AR-15 malfunctions. A ruptured cartridge can result in serious injury or death.
- Reliability: Proper headspace ensures reliable cycling and function of the firearm. Malfunctions stemming from incorrect headspace can disrupt your shooting experience.
- Accuracy: While not as directly impactful as safety and reliability, incorrect headspace can negatively impact accuracy over time.
How AR-15 Go/No-Go Gauges Work
AR-15 go/no-go gauges are simple, inexpensive tools comprising two cylindrical pieces of hardened steel. One gauge, the "go" gauge, represents the minimum acceptable headspace. The other, the "no-go" gauge, represents the maximum acceptable headspace.
Using the Gauges:
- Safety First: Always ensure the firearm is unloaded and the bolt is locked open.
- Insert the "Go" Gauge: Insert the "go" gauge into the chamber. It should chamber smoothly and fully. If it doesn't, there's a problem.
- Insert the "No-Go" Gauge: If the "go" gauge passes, insert the "no-go" gauge. This gauge should not chamber fully. It should stop before fully seating.
- Interpretation: If the "go" gauge chambers fully and the "no-go" gauge does not, your headspace is within acceptable limits.
What if the Gauges Fail the Test?
- "Go" Gauge Fails: This indicates short headspace. Your barrel may be damaged or improperly installed. Do not attempt to fire the weapon.
- "No-Go" Gauge Passes: This indicates excessive headspace, a much more serious issue. The bolt may not fully close on the round causing a potential catastrophic malfunction. This often indicates a worn or damaged bolt or barrel extension. Do not attempt to fire the weapon.
Types of AR-15 Go/No-Go Gauges
Go/No-Go gauges are available for various calibers and chamber specifications. It’s crucial to use a gauge specifically designed for the caliber of your AR-15 (e.g., 5.56 NATO, .223 Wylde). Using the wrong gauge can lead to inaccurate readings and false assumptions about your weapon's headspace.
Case Study: A Near Miss
A friend of mine experienced a catastrophic malfunction while shooting his AR-15. The cartridge ruptured, causing significant damage to his weapon and narrowly avoiding injury. Subsequent inspection revealed excessive headspace. Had he used go/no-go gauges regularly, this incident could have been avoided. This underscores the importance of preventative maintenance and the use of these simple yet critical tools.
Beyond the Gauges: Regular Maintenance
While go/no-go gauges are vital for checking headspace, they're just one component of responsible AR-15 ownership. Regular cleaning, lubrication, and inspection of all components are crucial for maintaining safety and reliability.
Conclusion: A Small Investment, Huge Returns
Investing in a set of AR-15 go/no-go gauges is a small price to pay for the peace of mind they offer. These tools provide a simple, reliable method for verifying headspace, significantly reducing the risk of catastrophic malfunctions. Regular use of go/no-go gauges, coupled with a proactive maintenance schedule, ensures the safe and reliable operation of your AR-15 for years to come. Don't gamble with your safety – use go/no-go gauges.