Colt AR 15 Ammo Size: A Comprehensive Guide
When it comes to the Colt AR 15, one of the most crucial aspects to consider is the ammunition size. The right ammunition can make a significant difference in the performance and reliability of your firearm. In this article, we will delve into the details of the Colt AR 15 ammo size, exploring its dimensions, types, and compatibility with various firearms. Let’s get started.
Understanding the Colt AR 15 Ammo Size
The Colt AR 15 is designed to use a specific ammunition size, which is commonly referred to as the 5.56x45mm NATO. This ammunition size is a popular choice among firearm enthusiasts due to its effectiveness and widespread availability. The 5.56x45mm NATO cartridge is a rimless, bottlenecked cartridge that measures approximately 5.56mm in diameter and 45mm in length.
It is important to note that while the Colt AR 15 is designed to use the 5.56x45mm NATO cartridge, there are other ammunition sizes that can be used with some modifications. However, using the correct ammunition size is crucial for optimal performance and safety.
Dimensions of the 5.56x45mm NATO Cartridge
Let’s take a closer look at the dimensions of the 5.56x45mm NATO cartridge:
| Dimension | Measurement |
|---|---|
| Overall Length | 45mm (1.772 inches) |
| Case Length | 22.2mm (0.874 inches) |
| Case Width | 5.56mm (0.218 inches) |
| Bullet Diameter | 5.56mm (0.218 inches) |
| Cartridge Overall Weight | 16.5 grams (0.585 ounces) |
These dimensions are essential for ensuring that the ammunition fits properly into the Colt AR 15 and functions correctly.
Types of Ammunition for the Colt AR 15
There are several types of ammunition available for the Colt AR 15, each with its own advantages and applications:
- Full Metal Jacket (FMJ): FMJ rounds are designed for target practice and are often used in competitions. They have a lead core encased in a metal jacket, which helps maintain the bullet’s shape upon impact.
- Full Metal Jacket, Incendiary (FMJ-IM): These rounds are similar to FMJ rounds but contain an incendiary tip, which can ignite flammable materials upon impact.
- Full Metal Jacket, Tracer (FMJ-Tracer): FMJ-Tracer rounds have a small tracer element that allows the shooter to see the bullet’s path in low-light conditions.
- Full Metal Jacket, Armor-Piercing (FMJ-AP): FMJ-AP rounds are designed to penetrate armor and are often used by military and law enforcement personnel.
- Full Metal Jacket, Ballistic Tip (FMJ-BT): FMJ-BT rounds have a polymer tip that helps improve accuracy and reduce wind drift.
When selecting ammunition for your Colt AR 15, it is essential to consider the intended use and the specific requirements of your firearm.
Compatibility with Other Firearms
While the Colt AR 15 is designed to use the 5.56x45mm NATO cartridge, it is important to note that not all firearms can accommodate this ammunition size. Some firearms may require modifications or use alternative ammunition sizes, such as the 5.45x39mm cartridge, which is similar to the 5.56x45mm NATO but with a slightly smaller diameter.
Before purchasing ammunition for your Colt AR 15, it is crucial to verify the compatibility with your specific firearm. This can be done by consulting the manufacturer’s specifications or seeking advice from a knowledgeable firearms expert.
Conclusion
Understanding the Colt AR 15 ammo size is essential for ensuring optimal performance
