A holster having a cavity and an axis defined along a side wall of the holster; a lever having a finger button portion and an engagement portion, wherein the lever is pivotally attached atop the side wall of the holster, along the axis, approximately between the finger button portion and the engagement portion, such that the finger button portion extends from the axis and is positioned above the frame/slide portion of the cavity and the engagement portion extends from the axis and is positioned above the trigger guard portion of the cavity; a hollow formed within a portion of the side wall; and a lockout lever rotatably secured within at least a portion of the hollow, and wherein a locking portion of the lockout lever is positioned beneath the finger button portion of the lever when the lockout lever is in a locked position.