The AR-15 platform, renowned for its modularity and adaptability, demands precision. Ensuring proper functioning and safety hinges on meticulous attention to detail, particularly when it comes to critical dimensions. This is where the go/no-go gauge becomes invaluable. This guide delves into the purpose, usage, and importance of go/no-go gauges specifically for AR-15 rifles.
Understanding Go/No-Go Gauges
A go/no-go gauge is a precision measuring tool consisting of two separate components: a "go" gauge and a "no-go" gauge. These gauges are designed to verify if a specific dimension, like the headspace of your AR-15's chamber, falls within the manufacturer's specified tolerances.
- Go Gauge: This gauge should fit smoothly into the chamber. If it doesn't, it indicates a problem.
- No-Go Gauge: This gauge should not fit into the chamber. If it does, it suggests excessive headspace, a serious safety concern.
Why Go/No-Go Gauges Are Crucial for AR-15s
Using go/no-go gauges for your AR-15 is paramount for several reasons:
- Safety: Incorrect headspace can lead to catastrophic malfunctions, including dangerous over-pressure situations that can result in serious injury or death. Regularly checking headspace helps mitigate this risk.
- Reliability: Proper headspace ensures reliable cycling and consistent performance of your rifle. Malfunctions caused by improper headspace can disrupt accuracy and overall functionality.
- Troubleshooting: Go/no-go gauges provide a definitive answer when troubleshooting malfunctions related to chamber dimensions. They allow for quick identification of potential problems before they escalate.
- Barrel Replacement: When replacing a barrel, using go/no-go gauges is essential to verify that the new barrel's chamber dimensions are within acceptable tolerances.
Using Go/No-Go Gauges: A Step-by-Step Guide
Using these gauges correctly is crucial for accurate readings. Follow these steps:
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Clean the Chamber: Ensure the chamber is thoroughly clean and free of any debris or obstructions. Any residue can impede accurate measurement.
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Insert the Go Gauge: Carefully insert the "go" gauge into the chamber. It should slide in smoothly without significant resistance.
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Insert the No-Go Gauge: Attempt to insert the "no-go" gauge. It should not fit into the chamber. Any significant insertion indicates excessive headspace.
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Interpretation:
- Go Gauge Fits, No-Go Gauge Does Not: This indicates that the headspace is within acceptable limits.
- Go Gauge Does Not Fit: This suggests the headspace is too tight.
- No-Go Gauge Fits: This indicates excessive headspace, a serious safety issue requiring immediate attention. Do not fire the weapon until the problem is addressed by a qualified gunsmith.
Choosing the Right Go/No-Go Gauge
Go/No-Go gauges are specific to the chambering of your AR-15 (e.g., 5.56 NATO, .223 Wylde). Always purchase gauges that are specifically designed for your rifle's caliber. Using incorrect gauges can lead to inaccurate readings and potentially dangerous conclusions.
Seeking Professional Help
If your go/no-go gauge test reveals an issue, do not attempt to fix it yourself. Contact a qualified and experienced gunsmith. Improper headspace correction can further compromise the safety and reliability of your AR-15.
This guide provides essential information on using go/no-go gauges for your AR-15. Remember, firearm safety is paramount. Regular checks and professional maintenance are crucial for responsible gun ownership.
