Originally utilized by Keeper Richards the loss of his right hand means reloading the weapon has become exceptionally difficult and therefore is only utilized as a last stand weapon before the latest Keeper was summoned by the Lighthouse to replaced the now crippled Richards.
Sadly Keeper Richards was mortally wounded on his last night at the Lighthouse and granted his successor the revolver along with any weapons and supplies left within the confines of the Lighthouse and the nearby cabin that has been Richard's home for the last decade.
Taking up the revolver the new Keeper found the revolver can fire standard 38 Special Rounds or be blessed by the Blue Flames to fire ice bullets that freezes it's target in place at the cost of firing rate. However there is risk of the target escaping so best kill the creature quickly.