FMJ bullets, according to the manufacturer, boost bullet penetration and damage against enemy equipment and killstreaks. As a result, if you want to demolish turrets and other equipment, this is the ammo to use. They are also effective against aircraft. In short, FMJs are perfect for destroying heavy armor such as that found on tanks and vehicles. They also work well against aircraft. The only downside to using FMJs is their price tag. Each box of 50 requires silver coins to purchase. This makes them unsuitable for use by players who don't have access to money or those who want to limit how much they spend on ammunition. However, if you're looking to destroy heavy armor quickly and efficiently, then these are the rounds to use.