Complete Old Guns
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Old Guns is a Minutemen main quest and achievement/trophy in .
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 old Castle's untapped armory. After some dialogue, the Old Guns quest will begin, and Ronnie will lead to a large hydraulic steel door within the Castle, she will say that this door is not accessible and 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.
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. This is done simply by scrapping the rubble in workshop mode. Inside are a few rooms with general junk and a shelf with ten cannonballs for the . 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.
Shaw will access a terminal that will open the armory. Inside is an array of plunder, including an artillery schematic and some artillery smoke grenades (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), (this is an optional task) and to throw a grenade into the test site (shown on the compass, and with a quest marker). If the have the radio station 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.