5.56x45mm NATO 62gr FMJ (M855)

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. 

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.