How to Check the Headspace on an AR-15
Ensuring that the headspace on your AR-15 rifle is properly checked and adjusted is crucial for the firearm’s accuracy and reliability. Headspace refers to the distance between the bolt face and the breech face of the chamber when the bolt is fully closed. If the headspace is too tight or too loose, it can lead to malfunctions, reduced accuracy, or even safety issues. In this detailed guide, we will walk you through the process of checking the headspace on your AR-15 rifle step by step.
Tools and Materials Needed
Before you begin, gather the following tools and materials:
- AR-15 headspace gauge
- Caliper
- Chamber brush
- Gun cleaning kit
- Gun oil or lubricant
- Locking bolt
- Shell holder
- Shell casing
Preparation
Start by ensuring that your AR-15 is unloaded and the chamber is clear of any ammunition. Remove the magazine and the bolt from the rifle. Clean the chamber thoroughly using the chamber brush and the gun cleaning kit. Apply a small amount of gun oil or lubricant to the bolt and the chamber to prevent rust and ensure smooth operation.
Checking the Headspace
Now that your rifle is prepared, follow these steps to check the headspace:
- Insert the headspace gauge into the chamber. Make sure it is fully seated and that the gauge is perpendicular to the breech face.
- Secure the bolt in the receiver. The bolt should be fully closed and latched.
- Insert a shell casing into the chamber, ensuring that it is fully seated. The shell casing should be the same caliber as the rifle.
- Insert the shell holder into the receiver, securing it in place. The shell holder should be designed for the specific caliber of your rifle.
- Place the locking bolt into the receiver and secure it. The locking bolt should be the same caliber as the rifle.
- Insert the headspace gauge into the shell holder, ensuring that it is fully seated and perpendicular to the breech face.
- Use the caliper to measure the distance between the bolt face and the breech face of the chamber. This distance is the headspace measurement.
Interpreting the Headspace Measurement
Once you have obtained the headspace measurement, compare it to the manufacturer’s specifications for your rifle. The specifications can typically be found in the rifle’s manual or on the manufacturer’s website. Here are some common headspace specifications for AR-15 rifles:
| Caliber | Minimum Headspace (inches) | Maximum Headspace (inches) |
|---|---|---|
| 5.56mm | 1.625 | 1.675 |
| 6.8mm SPC | 1.625 | 1.675 |
| 7.62mm NATO | 1.625 | 1.675 |
If the headspace measurement falls within the specified range, your rifle is properly headspaced. If the measurement is outside the range, you may need to adjust the headspace. This process typically involves replacing the bolt face or the chamber. It is recommended that you consult a professional gunsmith for assistance with headspace adjustment.
Conclusion
Checking the headspace on your AR-15 rifle is an important maintenance task that ensures the firearm’s accuracy and reliability. By following this detailed guide, you can easily check the headspace on your rifle and make any necessary adjustments. Remember to always prioritize safety and consult a professional if you are unsure about any aspect of the process.
