Look at the screen above and you'll see weapon stats on the left, a description of the mod and the changes it makes to your weapon in the middle, as well as the junk required to make the modification. Now highlight a Mod Slot to see your Mod options for that slot. Highlight a weapon in the Inventory and you'll see all the Mod Slots. Press X to Craft when you're standing in front of a Weapons Workbench. You'll find them in settlements such as Sanctuary as well as weapons stores in cities and in other locations like military bases. But you can also go a lot further, modding the range, increasing critical strikes, changing the type of damage, fitting a nasty blade on the front and even renaming it. You can increase a gun's magazine size and up its damage easily enough if that's all you need. How to build the most lethal weapons in Fallout 4 and choose the right Perks for gun nuts.įallout 4's weapon crafting is as complicated as you want it to be.