US 6141896 A abstract a lockable firearm safety is incorporated into the bolt mechanism of a safety bolt to selectively block the forward motion of the hammer by either of two means preventing the trigger from moving rearward which movement would release the hammer permitting it to move forward and strike the firing pin by directly blocking the hammer from moving forward to strike the firing pin when the safety bolt is placed in the safety position the bolt may be locked in the safety position by means of a key the firearm cannot be discharged until the safety bolt is unlocked and is moved to the fire position application_number US 6748798 A description with reference to the drawings wherein like numerals represent like parts throughout the several figures a lockable firearm safety in accordance with the present invention is generally designated by the numerals 10 fig1 2 110 fig1 and 210 fig1 the lockable firearm safety employs a key 12 112 fig1 12 212 fig1 for transforming the firearm between an unlocked and a locked safety position as will be detailed below the safety may assume a wide variety of forms and is configured as will be described below to be readily incorporated into conventional firearms to provide a trigger block type safety 10 or a hammer block type safety 110 which can be locked to prevent the safety from being displaced to the fire position the safety may also employ a conventional lock mechanism such as the embodiment of safety.