diff --git a/Plugins/Mineplex.Game.Clans/src/mineplex/game/clans/clans/ClansGame.java b/Plugins/Mineplex.Game.Clans/src/mineplex/game/clans/clans/ClansGame.java
index f59db05d6..8156714a2 100644
--- a/Plugins/Mineplex.Game.Clans/src/mineplex/game/clans/clans/ClansGame.java
+++ b/Plugins/Mineplex.Game.Clans/src/mineplex/game/clans/clans/ClansGame.java
@@ -4,6 +4,7 @@ import java.sql.Timestamp;
 
 import mineplex.core.MiniPlugin;
 import mineplex.core.blockrestore.BlockRestoreData;
+import mineplex.core.common.Rank;
 import mineplex.core.common.util.C;
 import mineplex.core.common.util.F;
 import mineplex.core.common.util.UtilBlock;
@@ -23,6 +24,7 @@ import mineplex.game.clans.core.repository.ClanTerritory;
 import mineplex.minecraft.game.core.damage.CustomDamageEvent;
 
 import org.bukkit.Bukkit;
+import org.bukkit.ChatColor;
 import org.bukkit.Effect;
 import org.bukkit.GameMode;
 import org.bukkit.Location;
@@ -62,6 +64,25 @@ public class ClansGame extends MiniPlugin
 		_clans = clans;
 	}
 	
+	public static boolean isDupedFromClassShop(ItemStack item)
+	{
+		if (item == null || item.getType() == Material.AIR)
+		{
+			return false;
+		}
+		if (!item.hasItemMeta() || !item.getItemMeta().hasDisplayName())
+		{
+			return false;
+		}
+		String name = ChatColor.stripColor(item.getItemMeta().getDisplayName()).toUpperCase();
+		if (name.contains("APPLY DEFAULT BUILD") || name.contains("APPLY BUILD") || name.contains("EDIT BUILD") || name.contains("DELETE BUILD"))
+		{
+			return true;
+		}
+		
+		return false;
+	}
+	
 	@EventHandler(ignoreCancelled = true)
 	public void openClanShop(PlayerInteractEvent event)
 	{
@@ -102,6 +123,26 @@ public class ClansGame extends MiniPlugin
 		
 		if (event.getBlock().getType() != Material.LADDER) return;
 		
+		if (isDupedFromClassShop(event.getItemInHand()))
+		{
+			event.setCancelled(true);
+			for (Player p : Bukkit.getOnlinePlayers())
+			{
+				if (ClansManager.getInstance().getClientManager().hasRank(p, Rank.HELPER))
+				{
+					UtilPlayer.message(p, F.elem("[" + C.cRedB + "!" + C.cGray + "] ") + event.getPlayer().getName() + " just tried to use a duped item/block!");
+				}
+			}
+			final int slot = event.getPlayer().getInventory().getHeldItemSlot();
+			ClansManager.getInstance().runSyncLater(() ->
+			{
+				event.getPlayer().getInventory().setItem(slot, new ItemStack(Material.AIR));
+				event.getPlayer().updateInventory();
+			}, 1L);
+			
+			return;
+		}
+		
 		if (_clans.getClanUtility().getAccess(event.getPlayer(), event.getBlock().getLocation()) == ClanRelation.SELF) return;
 		
 		final Block block = event.getBlock();
diff --git a/Plugins/Mineplex.Game.Clans/src/mineplex/game/clans/clans/siege/weapon/Cannon.java b/Plugins/Mineplex.Game.Clans/src/mineplex/game/clans/clans/siege/weapon/Cannon.java
index 0dc3b7a9a..fce9ea9d2 100644
--- a/Plugins/Mineplex.Game.Clans/src/mineplex/game/clans/clans/siege/weapon/Cannon.java
+++ b/Plugins/Mineplex.Game.Clans/src/mineplex/game/clans/clans/siege/weapon/Cannon.java
@@ -4,6 +4,7 @@ import java.util.List;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
+import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import org.bukkit.Material;
 import org.bukkit.Sound;
@@ -22,6 +23,7 @@ import org.bukkit.util.Vector;
 
 import com.google.common.collect.Lists;
 
+import mineplex.core.common.Rank;
 import mineplex.core.common.util.C;
 import mineplex.core.common.util.F;
 import mineplex.core.common.util.UtilAlg;
@@ -36,6 +38,8 @@ import mineplex.core.common.util.UtilServer;
 import mineplex.core.common.util.UtilTime;
 import mineplex.core.itemstack.ItemBuilder;
 import mineplex.game.clans.clans.ClanInfo;
+import mineplex.game.clans.clans.ClansGame;
+import mineplex.game.clans.clans.ClansManager;
 import mineplex.game.clans.clans.siege.SiegeManager;
 import mineplex.game.clans.clans.siege.events.SiegeWeaponExplodeEvent;
 import mineplex.game.clans.clans.siege.repository.tokens.SiegeWeaponToken;
@@ -216,6 +220,7 @@ public class Cannon extends SiegeWeapon
 		}));
 	}
 	
+	@SuppressWarnings("deprecation")
 	@EventHandler
 	protected void InventoryClick(InventoryClickEvent event)
 	{
@@ -224,7 +229,7 @@ public class Cannon extends SiegeWeapon
 			return;
 		}
 
-		if (event.getClick() == ClickType.SHIFT_RIGHT || event.getClick() == ClickType.SHIFT_RIGHT)
+		if (event.getClick() == ClickType.SHIFT_RIGHT || event.getClick() == ClickType.SHIFT_LEFT)
 		{
 			if(_inventory.getViewers().contains(event.getWhoClicked()))
 			{
@@ -282,6 +287,19 @@ public class Cannon extends SiegeWeapon
 		{
 			event.setCancelled(true);
 		}
+		else if (event.getSlot() == _ammunitionSlot && ClansGame.isDupedFromClassShop(event.getCursor()))
+		{
+			event.setCancelled(true);
+			for (Player p : Bukkit.getOnlinePlayers())
+			{
+				if (ClansManager.getInstance().getClientManager().hasRank(p, Rank.HELPER))
+				{
+					UtilPlayer.message(p, F.elem("[" + C.cRedB + "!" + C.cGray + "] ") + event.getWhoClicked().getName() + " just tried to use a duped item/block!");
+				}
+			}
+			event.setCursor(new ItemStack(Material.AIR));
+			((Player)event.getWhoClicked()).updateInventory();
+		}
 	}
 	
 	private void updateInventory()