Old Guns Old Guns is a Minutemen main quest and achievement / trophy in " Fallout 4 " . Detailed walkthrough . Starting the quest . This quest can be received from Preston Garvey in Sanctuary at a certain point in the game . Alternatively , a few days after securing the Castle , one will be approached and engaged in conversation by a woman named Ronnie Shaw , or by listening to Radio Freedom . She tells of the Castle ' s untapped armory . After some dialogue , the Old Guns quest will begin . Ronnie will lead the player to a large hydraulic steel door within the Castle . Since the door cannot be opened from the outside , the player character will need to find another way around . Ronnie then leads them inside the Castle ' s halls into the old general ' s office where a hallway ( now blocked by rubble ) leads to the armory . Lower tunnels . Ronnie Shaw will ask to clear the rubble . Using the workshop , the Sole Survivor can clear said rubble and gain access to the lower tunnels leading to the armory . Inside are a few rooms with general junk and a shelf with ten cannonball s for the Broadsider . There are also some minor defenses - - mines and a single level - dependent turret . This initial area has some environmental radiation . Just beyond , across from the chemistry station is a power generator with a fusion core . Guarding the far entrance is a heavy sentry bot called Sarge . Once the bot is destroyed , Shaw will gain access into the next room where General McGann ' s body is found and a computer containing his last entries . The next door leads to the West Bastion . West Bastion . Shaw will access a terminal that will open the armory . Inside is an array of plunder , including an artillery schematic and some artillery smoke grenade s ( inside a yellow ammo box container on the metal shelf ) , which are needed for the next part of the quest . After taking the schematic , it will add an artillery piece to the workshop under a new " Special " category . Speak to Ronnie and she will ask to build the artillery piece . Place it ( some pre - existing spots exist on the walls if preferred ) and assign a settler to them . After doing this , speak to Ronnie again and she wants to test the new artillery . Testing the Artillery Guns . Shaw asks the Sole Survivor to keep the Minutemen radio station on Radio Freedom ( optional ) and to throw a grenade into the test site ( shown on the compass , and with a quest marker ) . If the radio station is on , the Sole Survivor will hear Ronnie speaking on it . On approaching the test site , throw an artillery smoke grenade into the site and step back . After a few seconds the guns will fire and Ronnie will say the test was a success . After this , speak to Preston Garvey and complete the quest . Behind the scenes . There is a reference to the short story The Cask of Montresor ' s Amontillado by during this quest . After entering the locked room with General McGann ' s body inside , the player character can find Amontillado wine next to the corpse as well as a broken wall with a skeleton shackled inside across from the body . In the short story , a man hates another for insulting him . As revenge for the slight , the murderer lures his victim down into a cellar by promising him a drink of Amontillado wine , and buries him alive inside a wall in this same fashion . This short story was actually based on an urban legend about Fort Independence , wherein an officer is buried alive by the soldiers for killing a favored officer in a duel .