Federal American Eagle .223 Remington 55-grain FMJ (Full Metal Jacket) ammunition is designed for use with firearms chambered in .223 Remington or 5.56x45mm NATO. Here are some key details about this ammunition:

1. Caliber Compatibility: This ammunition is designed for use in firearms chambered for .223 Remington, such as bolt-action rifles, semi-automatic rifles, and some handguns, as well as firearms chambered for 5.56x45mm NATO.
2. Bullet Type: It features a Full Metal Jacket (FMJ) bullet. FMJ bullets have a lead core enclosed in a harder metal, typically copper. This design reduces lead fouling in the barrel and ensures reliable feeding and accuracy.
3. Bullet Weight: The bullet weight is 55 grains. Bullet weight can affect factors such as accuracy, velocity, and terminal ballistics.
4. Purpose: Federal American Eagle .223 Remington 55-grain FMJ ammunition is versatile and suitable for a wide range of purposes, including target shooting, plinking, and varmint hunting. The FMJ design is ideal for target practice and training.
5. Box Quantity: This ammunition is typically available in boxes containing a specific number of rounds. Common options include 20, 50, or 100 rounds per box.
6. Reliability: Federal is a reputable manufacturer of ammunition known for its reliability and consistent performance.
7. Availability: Federal American Eagle ammunition is widely available through reputable firearms retailers, sporting goods stores, and online vendors that specialize in ammunition.
8. Legal Considerations: Always be aware of and comply with local, state, and federal laws and regulations regarding the purchase, possession, and use of ammunition.

Federal American Eagle .223 Remington 55-grain FMJ ammunition is a popular choice among AR-15 rifle owners and other firearms enthusiasts. It offers consistent performance and is suitable for both range training and recreational shooting. Ensure that your firearm is chambered for .223 Remington or 5.56x45mm NATO and that you follow safe shooting practices when using this ammunition.