How to Tell What Your AR Is Chambered In
Understanding the caliber of your AR rifle is crucial for several reasons. Whether you’re looking to purchase ammunition, ensure compatibility with accessories, or simply satisfy your curiosity, knowing your rifle’s caliber is essential. In this detailed guide, I’ll walk you through various methods to determine the caliber of your AR rifle.
Checking the Magazine
The most straightforward way to identify your AR rifle’s caliber is by examining the magazine. Most magazines are clearly marked with the caliber they are designed for. Look for the caliber designation on the magazine body, often found near the feed lips or on the bottom of the magazine. Common calibers for AR rifles include .223 Remington, 5.56x45mm, .308 Win, and 7.62x39mm.
| Caliber | Magazine Markings |
|---|---|
| .223 Remington | 5.56mm, 5.56x45mm, .223 |
| 5.56x45mm | 5.56mm, 5.56x45mm |
| .308 Win | 7.62x51mm, .308 Win |
| 7.62x39mm | 7.62x39mm |
Inspecting the Rifle’s Receiver
Another method to determine your AR rifle’s caliber is by inspecting the receiver. The receiver is the central part of the rifle that houses the barrel and action. Look for the caliber markings on the receiver, which are typically found on the left side of the rifle. These markings may be in the form of a caliber name, caliber number, or a combination of both.
Checking the Barrel
The barrel is another component where you can find clues about your rifle’s caliber. Most barrels are marked with the caliber they are designed for. Look for the caliber markings on the barrel, which are usually located near the muzzle or on the barrel extension. These markings may be in the form of a caliber name, caliber number, or a combination of both.
Consulting the Manufacturer’s Manual
If you have the manufacturer’s manual for your AR rifle, it should provide information about the caliber. The manual may list the caliber directly or provide a diagram showing the caliber markings on the rifle. This is a reliable source for determining your rifle’s caliber.
Using Online Resources
There are numerous online resources available to help you identify your AR rifle’s caliber. Websites like Ballistics By The Inch (BBi) offer detailed information about various calibers and their corresponding barrel lengths. You can use this information to compare your rifle’s specifications and determine the caliber.
Seeking Professional Help
If you’re unable to determine your rifle’s caliber using the above methods, it’s best to consult a professional. Gunsmiths, firearms dealers, and shooting range employees can help you identify the caliber of your AR rifle. They may also be able to provide additional information about your rifle’s specifications and compatibility with accessories.
In conclusion, determining the caliber of your AR rifle is essential for various reasons. By examining the magazine, receiver, barrel, and consulting the manufacturer’s manual or online resources, you can easily identify your rifle’s caliber. If you’re still unsure, seeking professional help is the best course of action.
