The Callisto Protocol has a total of 5 different guns for Jacob to find and use in his escape from Black Iron Prison. While the Hand Cannon and the Riot Gun are given to him throughout the story, the other three guns will require you to find the schematics and build the weapon at a nearby 3-D printer.
After downloading the schematics for this pistol, you will also need to pay 600 Callisto Credits in order to build the gun. This weapon also has its own ammo that will begin appearing around the world after you create the weapon from the schematics.
Finding The Schematics
This weapon can be found in Chapter 6: Below. After seeing the new blind enemies, you’ll find yourself sneaking through the old colony and through heavily infested hallways. At one point, you’ll see the writing on the wall telling you not to make a sound. From here, you can either go right and take a short detour for loot or head left.
Heading left is both the correct route forward and the way to the schematics. Following this path will eventually have you pass two enemies on either side of the hallway. These enemies are grown into the wall and will climb out once you get close enough. After this encounter, continue down the path and look along the right side of the wall for a small room with lockers and a desk. The schematics for the pistol are on the desk along the left side of the room.
Tactical Pistol Upgrades
The Tactical Pistol is a more traditional handgun than the hand cannon. It has a larger magazine but fires smaller and weaker bullets. You can fire it much faster, and it is perfect for shooting the tentacles of multiple enemies who are about to transform. This weapon starts off with only ten bullets per magazine and can be upgraded to double it to twenty bullets. This weapon also comes with damage and stability upgrades. The tactical pistol is an excellent option for unloading many bullets into a few enemies at once or many bullets into just one enemy must faster than the previously received guns. Should you fire this gun quickly, the stability upgrade will significantly help in making sure all of your shots are on target.
This weapon’s alt-fire gives it a five-shot burst each time you pull the trigger. This burst is faster than trying to pull the trigger yourself in rapid succession. This alt fire is greatly benefited from the stability and magazine upgrades, as the burst fire would be incredibly ineffective without them. This burst fire can be devastating to enemies but can be harmful to your ammo reserves if not all five shots are required to finish off an enemy.