A firearm holster for securely enclosing a firearm is provided. A spring biased triggering lever is pivotally secured to the holster. A slider attached to the firearm holster slides on the slider base from a locked position to an unlocked position upon pressing the triggering lever. A spring-biased resettable drop lock is pivotally connected to a resettable drop lock mount attached to the holster and extends into an ejection port of a firearm secured in the firearm holster. The resettable drop lock pivots out of the ejection port of the firearm in the firearm holster by contact with the slider as the slider moves from a locked position into an unlocked position. A secondary lock includes a helical lock shaft disposed within a secondary lock body and extends from the lock body to rotate a secondary lock from a locked position to an unlocked position.