5.56x45mm NATO 62gr FMJ (M855) is a standard military ball cartridge featuring a 62-grain bullet with a green-painted tip, a steel penetrator core, and a lead core, designed for enhanced penetration against1 light barriers. It operates at high pressure (approx. 3060 fps), requires a 5.56 NATO chamber, and is commonly used for training, target shooting, and self-defense.
Key Details:
- Bullet Type: Full Metal Jacket (FMJ) with steel “penetrator” tip.
- Weight: 62 Grain (gr).
- Velocity: Approximately 3060 fps (feet per second).
- Usage: Ideal for tactical training and target shooting due to its consistent, flat-shooting nature.
- Compatibility: Designed for 5.56x45mm NATO chambers; not recommended for .223 Remington chambers due to higher pressure.
- Manufacturer Variations: Commonly produced by Winchester (Lake City), PMC, ADI, and others.
It is important to note that while “green tip” ammo is sometimes mischaracterized as armor-piercing, it is technically a “penetrator” round designed to penetrate steel helmets at extended ranges, but is not legally classified as armor-piercing handgun ammunition in many jurisdictions.


