{
//材料
  "materials": [
    {
      "item": {
//特定的某种材料
        "item": "minecraft:copper_ingot"
      },
      "count": 18
    },
    {
      "item": {
        "tag": "minecraft:logs"
      },
      "count": 16
    },
    {
      "item": {
//特定的某种材料
        "item": "minecraft:iron_ingot"
      },
      "count": 14
    }
  ],
 //输出结果
  "result": {
 //类型
    "type": "gun",
//输出物品
    "id": "emxarms:emx_scgraves"
  }
}