'''.50 Action Express''' is a type of [[ammunition]] for firearms. It is classified as a <span style="color:#0000AA">'''(P)'''</span>istol caliber, and was originally designed for the Desert Eagle, in order to provide the pistol platform with a [[IMI Desert Eagle Mark XIX 50|.50 caliber option]], which has since become the most popular and widely portrayed version of this handgun.
.50 Action Express is pronounced ''fifty Action Express''.
This caliber may also be known as '''.50 AE''', and sometimes as '''12.7x33mm'''. It may also be referred to as simply '''.50''', though it is not recommended, as it may be confused with the other .50 caliber cartridges in the game.