diff --git a/nms/all/pom.xml b/nms/all/pom.xml
index ef1306fd..96e63446 100644
--- a/nms/all/pom.xml
+++ b/nms/all/pom.xml
@@ -17,7 +17,6 @@
     <properties>
         <builtFilePath>target/${project.build.finalName}-${nms-classifier}.jar</builtFilePath>
     </properties>
-
     <!-- Ensure build order for assembly -->
     <dependencies>
         <dependency>
@@ -80,6 +79,10 @@
             <groupId>de.epiceric</groupId>
             <artifactId>shopchest-nms-v1_21_R2</artifactId>
         </dependency>
+        <dependency>
+            <groupId>de.epiceric</groupId>
+            <artifactId>shopchest-nms-v1_21_R3</artifactId>
+        </dependency>
     </dependencies>
 
     <build>
diff --git a/nms/pom.xml b/nms/pom.xml
index 78d92364..568a64aa 100644
--- a/nms/pom.xml
+++ b/nms/pom.xml
@@ -29,6 +29,7 @@
         <module>v1_20_R4</module>
         <module>v1_21_R1</module>
         <module>v1_21_R2</module>
+        <module>v1_21_R3</module>
         <module>all</module>
     </modules>
 
@@ -132,6 +133,12 @@
                 <version>1.0.0</version>
                 <scope>provided</scope>
             </dependency>
+            <dependency>
+                <groupId>de.epiceric</groupId>
+                <artifactId>shopchest-nms-v1_21_R3</artifactId>
+                <version>1.0.0</version>
+                <scope>provided</scope>
+            </dependency>
         </dependencies>
     </dependencyManagement>
 
diff --git a/nms/v1_21_R3/pom.xml b/nms/v1_21_R3/pom.xml
new file mode 100644
index 00000000..4fc624fe
--- /dev/null
+++ b/nms/v1_21_R3/pom.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>shopchest-nms</artifactId>
+        <groupId>de.epiceric</groupId>
+        <version>1.0.1</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>shopchest-nms-v1_21_R3</artifactId>
+    <version>1.0.0</version>
+
+    <properties>
+        <spigot.version>1.21.4-R0.1-SNAPSHOT</spigot.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.spigotmc</groupId>
+            <artifactId>spigot</artifactId>
+            <classifier>remapped-mojang</classifier>
+        </dependency>
+        <dependency>
+            <groupId>de.epiceric</groupId>
+            <artifactId>shopchest-nms-interface</artifactId>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>net.md-5</groupId>
+                <artifactId>specialsource-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
diff --git a/nms/v1_21_R3/src/main/java/de/epiceric/shopchest/nms/v1_21_R3/FakeArmorStandImpl.java b/nms/v1_21_R3/src/main/java/de/epiceric/shopchest/nms/v1_21_R3/FakeArmorStandImpl.java
new file mode 100644
index 00000000..ff62d679
--- /dev/null
+++ b/nms/v1_21_R3/src/main/java/de/epiceric/shopchest/nms/v1_21_R3/FakeArmorStandImpl.java
@@ -0,0 +1,90 @@
+package de.epiceric.shopchest.nms.v1_21_R3;
+
+import java.lang.reflect.Field;
+import java.util.List;
+import java.util.Optional;
+
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_21_R3.util.CraftChatMessage;
+import org.bukkit.entity.Player;
+
+import de.epiceric.shopchest.nms.FakeArmorStand;
+import net.minecraft.network.chat.Component;
+import net.minecraft.network.protocol.game.ClientboundEntityPositionSyncPacket;
+import net.minecraft.network.syncher.EntityDataAccessor;
+import net.minecraft.network.syncher.SynchedEntityData;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.entity.PositionMoveRotation;
+import net.minecraft.world.entity.decoration.ArmorStand;
+import net.minecraft.world.phys.Vec3;
+
+public class FakeArmorStandImpl extends FakeEntityImpl<String> implements FakeArmorStand {
+
+    private final static byte INVISIBLE_FLAG = 0b100000;
+    private final static byte MARKER_FLAG = 0b10000;
+    private final static EntityDataAccessor<Byte> DATA_SHARED_FLAGS_ID;
+    private final static EntityDataAccessor<Optional<Component>> DATA_CUSTOM_NAME;
+    private final static EntityDataAccessor<Boolean> DATA_CUSTOM_NAME_VISIBLE;
+    private final static float MARKER_ARMOR_STAND_OFFSET = 1.975f;
+
+    static {
+        try {
+            final Field dataSharedFlagsId = Entity.class.getDeclaredField(ObfuscatedFieldNames.DATA_SHARED_FLAGS_ID);
+            dataSharedFlagsId.setAccessible(true);
+            DATA_SHARED_FLAGS_ID = forceCast(dataSharedFlagsId.get(null));
+            final Field dataCustomNameField = Entity.class.getDeclaredField(ObfuscatedFieldNames.DATA_CUSTOM_NAME);
+            dataCustomNameField.setAccessible(true);
+            DATA_CUSTOM_NAME = forceCast(dataCustomNameField.get(null));
+            final Field dataCustomNameVisibleField = Entity.class
+                    .getDeclaredField(ObfuscatedFieldNames.DATA_CUSTOM_NAME_VISIBLE);
+            dataCustomNameVisibleField.setAccessible(true);
+            DATA_CUSTOM_NAME_VISIBLE = forceCast(dataCustomNameVisibleField.get(null));
+        } catch (ReflectiveOperationException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public FakeArmorStandImpl() {
+        super();
+    }
+
+    @Override
+    public void sendData(String name, Iterable<Player> receivers) {
+        sendData(receivers, name);
+    }
+
+    @Override
+    protected EntityType<?> getEntityType() {
+        return EntityType.ARMOR_STAND;
+    }
+
+    @Override
+    protected float getSpawnOffSet() {
+        return MARKER_ARMOR_STAND_OFFSET;
+    }
+
+    @Override
+    protected int getDataItemCount() {
+        return 4;
+    }
+
+    @Override
+    protected void addSpecificData(List<SynchedEntityData.DataValue<?>> packedItems, String name) {
+        packedItems.add(SynchedEntityData.DataValue.create(DATA_SHARED_FLAGS_ID, INVISIBLE_FLAG));
+        packedItems.add(SynchedEntityData.DataValue.create(DATA_CUSTOM_NAME, Optional.ofNullable(
+                CraftChatMessage.fromStringOrNull(name))));
+        packedItems.add(SynchedEntityData.DataValue.create(DATA_CUSTOM_NAME_VISIBLE, true));
+        packedItems.add(SynchedEntityData.DataValue.create(ArmorStand.DATA_CLIENT_FLAGS, MARKER_FLAG));
+    }
+
+    @Override
+    public void setLocation(Location location, Iterable<Player> receivers) {
+        final Vec3 pos = new Vec3(location.getX(), location.getY() + MARKER_ARMOR_STAND_OFFSET, location.getZ());
+        final PositionMoveRotation positionMoveRotation = new PositionMoveRotation(pos, Vec3.ZERO, 0f, 0f);
+        final ClientboundEntityPositionSyncPacket positionPacket = new ClientboundEntityPositionSyncPacket(entityId,
+                positionMoveRotation, false);
+        sendPacket(positionPacket, receivers);
+    }
+
+}
diff --git a/nms/v1_21_R3/src/main/java/de/epiceric/shopchest/nms/v1_21_R3/FakeEntityImpl.java b/nms/v1_21_R3/src/main/java/de/epiceric/shopchest/nms/v1_21_R3/FakeEntityImpl.java
new file mode 100644
index 00000000..f76cdefa
--- /dev/null
+++ b/nms/v1_21_R3/src/main/java/de/epiceric/shopchest/nms/v1_21_R3/FakeEntityImpl.java
@@ -0,0 +1,115 @@
+package de.epiceric.shopchest.nms.v1_21_R3;
+
+import de.epiceric.shopchest.nms.FakeEntity;
+import net.minecraft.network.protocol.Packet;
+import net.minecraft.network.protocol.game.ClientboundAddEntityPacket;
+import net.minecraft.network.protocol.game.ClientboundRemoveEntitiesPacket;
+import net.minecraft.network.protocol.game.ClientboundSetEntityDataPacket;
+import net.minecraft.network.syncher.EntityDataAccessor;
+import net.minecraft.network.syncher.SynchedEntityData;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.phys.Vec3;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_21_R3.entity.CraftPlayer;
+import org.bukkit.entity.Player;
+
+import java.lang.reflect.Field;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.UUID;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public abstract class FakeEntityImpl<T> implements FakeEntity {
+
+    private final static AtomicInteger ENTITY_COUNTER;
+    private final static EntityDataAccessor<Boolean> DATA_NO_GRAVITY;
+    private final static EntityDataAccessor<Boolean> DATA_SILENT;
+
+    static {
+        try {
+            final Field entityCounterField = Entity.class.getDeclaredField(ObfuscatedFieldNames.ENTITY_COUNTER);
+            entityCounterField.setAccessible(true);
+            ENTITY_COUNTER = (AtomicInteger) entityCounterField.get(null);
+            final Field dataNoGravityField = Entity.class.getDeclaredField(ObfuscatedFieldNames.DATA_NO_GRAVITY);
+            dataNoGravityField.setAccessible(true);
+            DATA_NO_GRAVITY = forceCast(dataNoGravityField.get(null));
+            final Field dataSilentField = Entity.class.getDeclaredField(ObfuscatedFieldNames.DATA_SILENT);
+            dataSilentField.setAccessible(true);
+            DATA_SILENT = forceCast(dataSilentField.get(null));
+        } catch (ReflectiveOperationException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    protected final int entityId;
+
+    public FakeEntityImpl() {
+        entityId = ENTITY_COUNTER.incrementAndGet();
+    }
+
+    @SuppressWarnings("unchecked")
+    protected static <T> T forceCast(Object o) {
+        return (T) o;
+    }
+
+    @Override
+    public int getEntityId() {
+        return entityId;
+    }
+
+    protected void sendPacket(Packet<?> packet, Iterable<Player> receivers) {
+        for (Player receiver : receivers) {
+            ((CraftPlayer) receiver).getHandle().connection.send(packet);
+        }
+    }
+
+    @Override
+    public void spawn(UUID uuid, Location location, Iterable<Player> receivers) {
+        final ClientboundAddEntityPacket spawnPacket = new ClientboundAddEntityPacket(
+                entityId,
+                uuid,
+                location.getX(),
+                location.getY() + getSpawnOffSet(),
+                location.getZ(),
+                0f,
+                0f,
+                getEntityType(),
+                0,
+                Vec3.ZERO,
+                0d
+        );
+        sendPacket(spawnPacket, receivers);
+    }
+
+    @Override
+    public void remove(Iterable<Player> receivers) {
+        final ClientboundRemoveEntitiesPacket removePacket = new ClientboundRemoveEntitiesPacket(entityId);
+        sendPacket(removePacket, receivers);
+    }
+
+    protected void sendData(Iterable<Player> receivers, T data) {
+        // Create packet
+        final List<SynchedEntityData.DataValue<?>> packedItems = new LinkedList<>();
+        final ClientboundSetEntityDataPacket dataPacket = new ClientboundSetEntityDataPacket(entityId, packedItems);
+
+        // Setup data
+        packedItems.add(SynchedEntityData.DataValue.create(DATA_NO_GRAVITY, true));
+        packedItems.add(SynchedEntityData.DataValue.create(DATA_SILENT, true));
+        addSpecificData(packedItems, data);
+
+        // Send packet
+        sendPacket(dataPacket, receivers);
+    }
+
+    protected abstract EntityType<?> getEntityType();
+
+    protected float getSpawnOffSet() {
+        return 0f;
+    }
+
+    protected abstract int getDataItemCount();
+
+    protected abstract void addSpecificData(List<SynchedEntityData.DataValue<?>> packedItems, T data);
+
+}
diff --git a/nms/v1_21_R3/src/main/java/de/epiceric/shopchest/nms/v1_21_R3/FakeItemImpl.java b/nms/v1_21_R3/src/main/java/de/epiceric/shopchest/nms/v1_21_R3/FakeItemImpl.java
new file mode 100644
index 00000000..8d6aeec0
--- /dev/null
+++ b/nms/v1_21_R3/src/main/java/de/epiceric/shopchest/nms/v1_21_R3/FakeItemImpl.java
@@ -0,0 +1,60 @@
+package de.epiceric.shopchest.nms.v1_21_R3;
+
+import de.epiceric.shopchest.nms.FakeItem;
+import net.minecraft.network.protocol.game.ClientboundSetEntityMotionPacket;
+import net.minecraft.network.syncher.EntityDataAccessor;
+import net.minecraft.network.syncher.SynchedEntityData;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.entity.item.ItemEntity;
+import net.minecraft.world.phys.Vec3;
+import org.bukkit.craftbukkit.v1_21_R3.inventory.CraftItemStack;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+
+import java.lang.reflect.Field;
+import java.util.List;
+
+public class FakeItemImpl extends FakeEntityImpl<ItemStack> implements FakeItem {
+
+    private final static EntityDataAccessor<net.minecraft.world.item.ItemStack> DATA_ITEM;
+
+    static {
+        try {
+            final Field dataItemField = ItemEntity.class.getDeclaredField(ObfuscatedFieldNames.DATA_ITEM);
+            dataItemField.setAccessible(true);
+            DATA_ITEM = forceCast(dataItemField.get(null));
+        } catch (ReflectiveOperationException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public FakeItemImpl() {
+        super();
+    }
+
+    @Override
+    public void sendData(ItemStack item, Iterable<Player> receivers) {
+        sendData(receivers, item);
+    }
+
+    @Override
+    public void resetVelocity(Iterable<Player> receivers) {
+        final ClientboundSetEntityMotionPacket velocityPacket = new ClientboundSetEntityMotionPacket(entityId, Vec3.ZERO);
+        sendPacket(velocityPacket, receivers);
+    }
+
+    @Override
+    protected EntityType<?> getEntityType() {
+        return EntityType.ITEM;
+    }
+
+    @Override
+    protected int getDataItemCount() {
+        return 1;
+    }
+
+    @Override
+    protected void addSpecificData(List<SynchedEntityData.DataValue<?>> packedItems, ItemStack data) {
+        packedItems.add(SynchedEntityData.DataValue.create(DATA_ITEM, CraftItemStack.asNMSCopy(data)));
+    }
+}
diff --git a/nms/v1_21_R3/src/main/java/de/epiceric/shopchest/nms/v1_21_R3/ObfuscatedFieldNames.java b/nms/v1_21_R3/src/main/java/de/epiceric/shopchest/nms/v1_21_R3/ObfuscatedFieldNames.java
new file mode 100644
index 00000000..67977f2a
--- /dev/null
+++ b/nms/v1_21_R3/src/main/java/de/epiceric/shopchest/nms/v1_21_R3/ObfuscatedFieldNames.java
@@ -0,0 +1,15 @@
+package de.epiceric.shopchest.nms.v1_21_R3;
+
+public class ObfuscatedFieldNames {
+
+    // Entity
+    public static final String ENTITY_COUNTER = "c";
+    public static final String DATA_NO_GRAVITY = "aR";
+    public static final String DATA_SILENT = "aQ";
+    public static final String DATA_SHARED_FLAGS_ID = "am";
+    public static final String DATA_CUSTOM_NAME = "aO";
+    public static final String DATA_CUSTOM_NAME_VISIBLE = "aP";
+    // ItemEntity
+    public static final String DATA_ITEM = "c";
+
+}
diff --git a/nms/v1_21_R3/src/main/java/de/epiceric/shopchest/nms/v1_21_R3/PlatformImpl.java b/nms/v1_21_R3/src/main/java/de/epiceric/shopchest/nms/v1_21_R3/PlatformImpl.java
new file mode 100644
index 00000000..8d6cfc78
--- /dev/null
+++ b/nms/v1_21_R3/src/main/java/de/epiceric/shopchest/nms/v1_21_R3/PlatformImpl.java
@@ -0,0 +1,19 @@
+package de.epiceric.shopchest.nms.v1_21_R3;
+
+import de.epiceric.shopchest.nms.FakeArmorStand;
+import de.epiceric.shopchest.nms.FakeItem;
+import de.epiceric.shopchest.nms.Platform;
+
+public class PlatformImpl implements Platform {
+
+    @Override
+    public FakeArmorStand createFakeArmorStand() {
+        return new FakeArmorStandImpl();
+    }
+
+    @Override
+    public FakeItem createFakeItem() {
+        return new FakeItemImpl();
+    }
+
+}
diff --git a/plugin/src/main/java/de/epiceric/shopchest/nms/PlatformLoader.java b/plugin/src/main/java/de/epiceric/shopchest/nms/PlatformLoader.java
index f9935b1e..af76f5ef 100644
--- a/plugin/src/main/java/de/epiceric/shopchest/nms/PlatformLoader.java
+++ b/plugin/src/main/java/de/epiceric/shopchest/nms/PlatformLoader.java
@@ -118,6 +118,8 @@ private Platform getSpecificPlatform(String mappingsVersion) {
                 return new de.epiceric.shopchest.nms.v1_21_R1.PlatformImpl();
             case "61a218cda78417b6039da56e08194083": // 1.21.3 (v1_21_R2)
                 return new de.epiceric.shopchest.nms.v1_21_R2.PlatformImpl();
+            case "60ac387ca8007aa018e6aeb394a6988c": // 1.21.4 (v1_21_R3)
+                return new de.epiceric.shopchest.nms.v1_21_R3.PlatformImpl();
             default:
                 return null;
         }