diff --git a/src/main/java/com/atsuishio/superbwarfare/item/gun/GunItem.java b/src/main/java/com/atsuishio/superbwarfare/item/gun/GunItem.java
index a50cd799e..6616232f0 100644
--- a/src/main/java/com/atsuishio/superbwarfare/item/gun/GunItem.java
+++ b/src/main/java/com/atsuishio/superbwarfare/item/gun/GunItem.java
@@ -108,6 +108,23 @@ public abstract class GunItem extends Item implements CustomRendererItem, GeoIte
         return false;
     }
 
+    private void checkCopyGuns(ItemStack stack, Player player) {
+        var data = GunData.from(stack);
+        if (!data.initialized()) return;
+        var uuid = data.data.getUUID("UUID");
+
+        for (var item : player.getInventory().items) {
+            if (item.equals(stack)) continue;
+            if (item.getItem() instanceof GunItem) {
+                var itemData = GunData.from(item);
+                if (itemData.data.getUUID("UUID").equals(uuid)) {
+                    data.data.putUUID("UUID", UUID.randomUUID());
+                    return;
+                }
+            }
+        }
+    }
+
     @Override
     @ParametersAreNonnullByDefault
     public void inventoryTick(ItemStack stack, Level level, Entity entity, int slot, boolean selected) {
@@ -119,6 +136,10 @@ public abstract class GunItem extends Item implements CustomRendererItem, GeoIte
 
         var data = GunData.from(stack);
 
+        if (living instanceof Player player && selected) {
+            checkCopyGuns(stack, player);
+        }
+
         if (!data.initialized()) {
             data.initialize();
             if (level.getServer() != null && entity instanceof Player player && player.isCreative()) {