Maintaining a properly functioning firearm is paramount for both safety and accuracy. One crucial aspect of rifle maintenance often overlooked is verifying the chamber's dimensions. This is where the 5.56 NATO no-go gauge comes into play. This article will delve into the importance of using a no-go gauge, how to use it correctly, and what to do if your chamber fails the test.
What is a No-Go Gauge?
A no-go gauge is a precision-machined tool used to check the headspace of a firearm's chamber. Headspace refers to the distance between the bolt face and the breech face of the cartridge case when the round is chambered. Incorrect headspace can lead to catastrophic failures, including dangerous malfunctions and potential injury. The no-go gauge represents the maximum acceptable headspace; if the gauge fits, your headspace is too large and needs immediate attention.
Specifically, a 5.56 NATO no-go gauge is designed for rifles chambered in 5.56x45mm NATO, such as the AR-15 platform. It's crucial to use the correct gauge for your specific caliber; using an incorrect gauge can lead to misinterpretations and potentially unsafe practices.
Why is Checking Headspace Important?
Improper headspace can result in several serious problems:
- Squib Loads: A squib load is a cartridge that fails to fully ignite, leaving a bullet lodged in the barrel. This can cause a dangerous obstruction and potentially damage your weapon when you attempt to fire another round.
- Case Head Separation: Excessive headspace can cause the cartridge case to separate during firing, leading to damage to the firearm and potential injury to the shooter.
- Bullet Setback: This occurs when the bullet is pushed back into the cartridge case, reducing accuracy and potentially leading to unsafe conditions.
- Chamber Pressure Issues: Incorrect headspace can lead to dangerously high chamber pressure, potentially causing the firearm to burst or malfunction severely.
Regularly checking headspace with a no-go gauge is a proactive safety measure that can prevent these potentially devastating issues.
How to Use a 5.56 No-Go Gauge
Using a no-go gauge is straightforward but requires careful attention to detail:
- Ensure Safety: Always treat your firearm as if it were loaded, even when performing maintenance. Keep the muzzle pointed in a safe direction.
- Clean the Chamber: Before using the gauge, ensure the chamber is clean and free of debris. Any obstruction could interfere with the gauge's accuracy.
- Insert the Gauge: Insert the gauge into the chamber. Do not force it.
- Interpret the Results:
- Gauge Does NOT Go In: This indicates your headspace is within the acceptable range.
- Gauge Goes In Easily: This is a serious problem indicating excessive headspace. Do not fire your rifle until the issue is resolved by a qualified gunsmith.
What to Do if the No-Go Gauge Fits
If your 5.56 no-go gauge fits into the chamber, it signifies a significant problem. Immediately cease firing the rifle. Do not attempt to repair the issue yourself. Contact a qualified and experienced gunsmith to inspect and repair the firearm. They can diagnose the cause of the excessive headspace and perform the necessary repairs.
Conclusion
Regular inspection of your firearm's headspace using a 5.56 NATO no-go gauge is a critical aspect of responsible gun ownership. This simple procedure can prevent serious accidents and ensure the longevity and safety of your rifle. Remember, safety should always be your top priority. If you have any doubts or uncertainties, consult a qualified gunsmith.
