Abstract: The present invention provides an automatic magazine ejector for a firearm. The invention provides a magazine ejection device for a firearm having a receiver, a magazine, wherein the magazine has an engaged state and a disengaged state of operation, comprising: a trigger housing having first and second opposing sides, a cavity defined by the first and second opposing sides, a pin spanning the cavity and a recess within at least one of the first and second opposing sides; and, a spring having first and second ends, the second end being disposed within the recess when the device is in use and wherein the first end being operably configured to engage and apply a force on the magazine when the device is in use and the magazine is in the engaged state. The invention also includes a method of modifying an existing firearm to include an automatic magazine ejection device.