Introduction
The unmistakable crack of a rifle shot echoing through the range. The satisfying thud as a target falls. For many firearm enthusiasts, these are the moments that define their passion. But behind the thrill of the sport lies a crucial element: safety. Ensuring your firearm functions correctly and safely is paramount. One critical aspect often overlooked, especially by newer gun owners, is headspace. And for those who own a 7.62×39 rifle, understanding the concept of a “No Go Gauge” is not just recommended; it’s essential for responsible firearm ownership.
The 7.62×39 cartridge, a powerhouse known for its effectiveness, has become a staple for many hunters, recreational shooters, and even some collectors. The AK-47 and its many variants, chambered for this round, represent a significant portion of the firearms landscape. Given the widespread use and popularity of this caliber, understanding its nuances, and importantly, its safety requirements, is extremely important for everyone involved. But how do you know if your rifle is operating safely? How can you minimize the chance of a potentially dangerous situation? The answer often lies in a small, unassuming tool: the “No Go Gauge.”
Headspace and Its Significance
To understand why a “No Go Gauge” is so vital, we must first delve into the concept of headspace. Headspace, in simple terms, is the distance between the bolt face of the firearm and the point in the chamber where the cartridge case stops when fully seated. It’s a crucial measurement that dictates how the cartridge fits within the chamber. Think of it like the perfect fit of a key in a lock; if it’s too short or too long, the lock won’t function.
In a firearm, incorrect headspace presents a serious risk.
Excessive headspace is like having too much space. The cartridge may move too far forward in the chamber when the firing pin strikes the primer. This movement, combined with the pressure generated by the burning propellant, can cause the case to stretch or even rupture. Case ruptures release hot gases and debris back towards the shooter’s face and eyes. This can lead to serious injury, even blindness.
Insufficient headspace is the opposite problem: too little space. The cartridge may not fully seat in the chamber, or the bolt may not close completely. If the bolt does close, the cartridge may experience excessive pressure during firing. This can lead to a catastrophic failure of the firearm.
Consequences of improper headspace can be very serious, ranging from minor malfunctions to life-threatening situations. A firearm with improper headspace may:
- Fail to Fire: The firing pin may not be able to strike the primer with enough force to ignite the propellant.
- Experience Extraction Problems: The fired case may stick in the chamber, making it difficult to extract.
- Rupture the Case: As previously mentioned, excessive headspace can lead to the case rupturing, releasing high-pressure gases.
- Cause a Catastrophic Failure: In the most extreme cases, the firearm could explode.
Clearly, the implications of improper headspace are significant, underscoring the critical role of regular inspections and proper maintenance.
What is a “No Go Gauge?”
So, how do you determine if the headspace on your 7.62×39 rifle is within safe limits? That’s where the “No Go Gauge” comes in. A “No Go Gauge” is a precision-machined tool, typically made from hardened steel. It’s a “go/no-go” device. In essence, it’s a replica of a 7.62×39 cartridge, but it’s manufactured to a specific length that represents the *maximum* safe headspace for the 7.62×39 cartridge.
The purpose of the “No Go Gauge” is simple: to check the maximum safe headspace of your rifle’s chamber. It acts as a critical safety check, indicating whether the firearm is within acceptable tolerances.
There aren’t many variations regarding the “No Go Gauge,” mainly because the tool is designed around the physical dimensions of the cartridge. “No Go Gauges” are typically made from high-quality steel to ensure durability and precision. Some may have a protective coating for corrosion resistance. The important factor is that the gauge is manufactured to the correct specifications for the 7.62×39 cartridge.
Using a “No Go Gauge” for 7.62×39 Rifles
Using a “No Go Gauge” is a straightforward process, but it requires careful attention to detail and adherence to safety protocols. Always make sure the firearm is unloaded before starting any of these procedures. Here’s a step-by-step guide:
- Safety First: Ensure that your firearm is unloaded. Remove the magazine, open the action, visually and physically inspect the chamber and receiver to confirm that it is empty. Point the muzzle in a safe direction throughout the entire procedure. Double-check that there is no ammunition in the area.
- Remove the Bolt: Disassemble your rifle as necessary to remove the bolt from the receiver. This usually involves some mechanical process like pulling a charging handle back and upwards. Consult your firearm’s manual for specific instructions.
- Insert the “No Go Gauge”: With the bolt removed, insert the “No Go Gauge” into the chamber of your rifle. The gauge should seat snugly.
- Attempt to Close the Bolt: Gently attempt to close the bolt on the “No Go Gauge”. Do not force it. The gauge is manufactured to precise tolerances to indicate if the bolt can or cannot fully close.
- Interpreting the Results: The results will indicate whether or not the headspace of the firearm is within safe operating parameters.
- Bolt Closes: If the bolt closes completely on the “No Go Gauge”, it indicates that the headspace of your rifle is *potentially excessive.* The bolt closed despite the fact that the gauge represents the maximum safe headspace. You should take the rifle to a qualified gunsmith for a complete inspection immediately. This is an unsafe condition and needs immediate professional attention.
- Bolt Does Not Close: If the bolt *does not* close completely on the “No Go Gauge”, the headspace is within the safe limits. The bolt will not close because the gauge is longer than a safe cartridge. This does *not* mean the headspace is perfect, but the rifle is operating within acceptable parameters. The headspace is safe, although ideally, you would want to know the exact measurement.
Addressing Issues
What do you do if the “No Go Gauge” reveals a problem? The most important thing is to remain calm and take the appropriate steps to address the issue.
If the bolt closes on the “No Go Gauge,” your firearm is potentially unsafe and should not be fired. Do not attempt to fire the rifle. Here’s what you should do:
- Consult a Qualified Gunsmith: The best course of action is to take your rifle to a qualified gunsmith. A gunsmith has the expertise and tools to accurately diagnose the issue and make the necessary repairs.
- Do Not Attempt Repairs Yourself: Headspace issues are often complex and require specialized knowledge and equipment. Attempting to fix the problem yourself without proper training could make the situation worse or even lead to injury.
- Potential Repairs or Solutions: A gunsmith will likely assess the situation and may perform the following repairs:
- Replace the Bolt: A worn or damaged bolt can contribute to excessive headspace. Replacing the bolt may be the solution.
- Replace the Barrel: If the chamber is worn or damaged, the barrel may need to be replaced.
- Adjust the Headspace: Depending on the design of the rifle, the gunsmith might be able to adjust the headspace. This could involve using different bolt components or other modifications.
Where to Buy a “No Go Gauge” and Other Related Tools
Finding the right “No Go Gauge” is not difficult. Numerous reputable suppliers specialize in firearm tools and accessories. Here are some recommendations:
- Online Retailers: Websites such as Brownells, MidwayUSA, and others that specialize in gunsmithing tools.
- Local Gun Shops: Many local gun shops carry or can order “No Go Gauges.”
The cost of a “No Go Gauge” is relatively modest, usually ranging from a moderate amount. This is a small price to pay for the peace of mind and safety that it provides.
Beyond the “No Go Gauge,” you should also consider acquiring other related tools that can aid in firearm maintenance and ensure your safety. These might include a “Go Gauge,” a cleaning rod, and a good-quality bore brush.
Important Safety Considerations
Using a “No Go Gauge” is just one component of responsible firearm ownership. It is important to remember these crucial safety principles.
Always Treat Firearms as Loaded
This fundamental rule means assuming every firearm is loaded, even if you believe it is not. Always point the muzzle in a safe direction, and keep your finger off the trigger until you are ready to fire.
Proper Cleaning and Maintenance
Regularly clean and maintain your firearm to ensure it functions properly. This includes cleaning the bore, lubricating moving parts, and inspecting for any signs of wear or damage. Follow the manufacturer’s instructions for cleaning and maintenance.
Consult Professionals
Do not hesitate to seek professional help if you are unsure about any aspect of firearm maintenance or repair. A qualified gunsmith can provide invaluable advice and assistance.
Regular inspections, with the “No Go Gauge” and other tools, are part of any good maintenance plan.
Conclusion
In conclusion, the “No Go Gauge” is an essential tool for anyone who owns or uses a 7.62×39 rifle. It provides a quick and effective way to assess the headspace of your firearm, ensuring that it is operating within safe parameters. Neglecting to check headspace could lead to serious consequences. Remember that ensuring the safety of yourself and those around you is a primary responsibility of every firearm owner.
Owning a firearm is a privilege that comes with significant responsibility. By understanding the function of the “No Go Gauge” and diligently employing it as part of your regular maintenance routine, you’re taking a crucial step towards ensuring your own safety, the safety of others, and the longevity of your valuable firearm.
The next time you reach for your 7.62×39 rifle, take a few moments to think about safety. Make checking the headspace with a “No Go Gauge” a routine practice. This simple act can make a big difference.
