A holster having a lever with a finger button portion and an engagement portion, wherein the engagement portion of the lever includes a locking projection extending from a second side of the engagement portion; wherein the lever is pivotally attached to the holster, approximately between the finger button portion and the engagement portion, such that the finger button portion is positioned above the frame/slide portion of the cavity and the engagement portion is positioned above the trigger guard portion of the cavity; one or more ridge segments positioned around at least a portion of the lever; and a lockout lever pivotably attached to the first side wall such that the lockout lever is able to be rotated between a locked position and an unlocked position, and wherein the lockout lever is positioned beneath the finger button portion of the lever when the lockout lever is in the locked position.