Full metal jacket bullets are a type of ammunition designed with a soft core, usually made of lead, encased in a harder metal shell. This design helps the bullet maintain its shape and integrity during flight, reducing the likelihood of deformation upon impact. As a result, these bullets are known for their ability to penetrate targets effectively. These bullets are commonly used in military and law enforcement applications due to their reliable performance and reduced risk of fragmentation. However, they are also criticized for their potential to cause severe injuries, as they can pass through targets without expanding, leading to deeper wounds.