Tab 1: Craft - Here you craft guns, using all the components.
Tab 2: Upgrade - Lets you upgrade your gun, but not to anything worse. Works just like the cration of them. Extra costs (EXP) applied.
Tab 3: Repair - Repair broken guns with wrenches. A wrench restores 10 durability per use.
Tab 4: Help - Help page, containing all recipes and more information.
Wrench
Recipe: unknown
Durability: 5
Broken guns
When a gun has lost all it's durability, it becomes a "broken gun". It can then be repaired, but restores only 10 durability and takes 3 durability to the wrench.
Gun textures
All different guns should have dfferent textures now, at least a few to start with.
Gun workbench
Wrench
Broken guns
Gun textures