FMJ, or full metal jacket, ammo is a type of ammunition that is encased in a metal jacket. The jacket serves two purposes: to protect the bullet from wearing down as it moves through the barrel and to help it retain its shape when it hits a target. FMJ bullets are typically used for target practice or plinking (shooting at targets for fun), as they are less likely to damage instruments than other types of ammunition.
Natalee Answered question June 29, 2022