The MAC-10 is a compact fully automatic secondary gun in Operation 7.
Having a terribly high rate of fire, it eats up its magazine pretty fast. Being a compact weapon, that high rate of fire may be uncontrollable and will cause a lot of recoil and spread within less than a second after the first bullet. However, it uses .45 rounds that are pretty powerful, but they contribute to the inaccuracy. Don't expect to use this weapon in mid-far ranges, the bullets will fly everywhere even with short, controlled bursts. Its light weight and the power makes it a very useful weapon in close-quarters situations, or even when you're out of ammo in your primary weapon's magazine.
Please note that due to the high damage rounds, rate of fire and the usage of the pray and spray technique, it is looked down upon to use this weapon.