A holster for a handgun, having at least some of an at least partial cavity; a lever having a finger button portion and an engagement portion, wherein the lever includes a locking projection extending from at least a portion of the engagement portion, and wherein the lever is pivotally attached or coupled to at least a portion of the holster, approximately between the finger button portion and the engagement portion; and a lockout element rotatably attached or coupled to at least a portion of the holster such that the lockout element is rotatable between a locked position and an unlocked position, and wherein at least a portion of a locking portion of the lockout element is positioned above at least a portion of the engagement portion of the lever when the lockout element is in the locked position.