A holster for a handgun, the holster having an axis that separates a frame / slide portion of the holster from a trigger guard portion of the holster and a lever having a finger button end and an engagement end, wherein the engagement end of the lever includes a locking portion protruding from a second side of the engagement end, wherein the lever is pivotally attached to a side wall of the holster, along the axis, approximately between the finger button end and the engagement end, such that the finger button end extends into the frame / slide portion of the holster and the engagement end extends into the trigger guard portion of the holster, wherein the lever is pivotable between an engaged position and a disengaged position, and wherein, when the lever is in the engaged position, the locking portion protrudes into a holster cavity, via an opening in the side wall.