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The first and perhaps most important step in Guncrafter is actually crafting your weapon so you can destroy all the blocks your heart desires.
When you first start out you will only have the smallest workbench size of 4×4 and can only use wood crafting materials. You can purchase bigger workspaces and better materials with coins that you gain from winning matches and other things.
Now for a gun to be functional there are really only four things you need; the barrel of the gun where the bullets will come out, a sight to help with accuracy, a trigger and then at least one normal block for it all to attach to.