Flintlock: The Siege of Dawn contains 11 Firearm Locations. Finding all Firearms unlocks Full Arsenal trophy or achievement. There are 7 Firearms in the first map of the game “Three Peaks” and another 4 in the second map of the game “Wanderer’s Rest”. Most Firearms are unlocked after completing Side Quests or Sapper Quests. While this guide is intended for use during the story, all Firearms can still be found after the story, nothing is missable because there’s still free-roam after the story.

Three Peaks

1. Nor’s Pistol: automatic, story-related unlock, cannot be missed. You start the game with this weapon.
2. Marksman’s Musket: automatic, story-related unlock, cannot be missed. Given to you by Baz after unlocking the campsite at Pilgrim’s Band as part of the Main Quest Battle Hardened.
3. Marauder’s Pistol: inside a chest on the upper level of Mile End’s Barricade.
   
4. Baz’s Blunderbass: automatically obtained while clearing Sapper Quest Lost to Battle.
5. Sunderer’s Flintlock: can be found at the very top of Enlightened Peak, in a chest in a small arena where you have to fight some enemies as part of the Side Quest A Delayed Reunion.
   
6. Hand Mortar: immediately after entering the Sulfur Mines, on the main path. Hard to miss.
   
7. Ricochet Cannon: when inside the Sulfur Mines, follow the main path until you get to a tunnel with a skeleton marksman and a skeleton swordsman. Then, turn around and follow the path into the side cave with many explosive barrels. Climb up where there are two additional skeleton marksmen and you’ll find the chest containing this firearm.
   

Wanderer’s Rest

1. Wildfire Mortar: reward for completing Side Quest No Rest for the Wicked.
2. Skirmisher’s Pistol: reward for completing Side Quest When Duty Calls.
3. Firespitter: reward for completing Sapper Quest In Safe Hands.
4. Fire Cannon: at the very top of Breakwater Cliffs. You’ll come to this territory as part of Side Quest To Turn the Tide. Once you’ve completed the side quest, continue upwards until you find this chest past some bird enemies.
   

These are all the Firearm locations in Flintlock: The Siege of Dawn.