Init

src/main/java/systems/brn/plasticgun/lib/GunComponents.java

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+package systems.brn.plasticgun.lib;
+
+import com.mojang.serialization.Codec;
+import eu.pb4.polymer.core.api.other.PolymerComponent;
+import net.minecraft.component.ComponentType;
+import net.minecraft.item.ItemStack;
+import net.minecraft.registry.Registries;
+import net.minecraft.registry.Registry;
+
+import java.util.function.UnaryOperator;
+
+
+public class GunComponents {
+    public static final ComponentType<ItemStack> GUN_AMMO_COMPONENT = register("gunammo", builder -> builder.codec(ItemStack.CODEC));
+    public static final ComponentType<Integer> GUN_LOADING_COMPONENT = register("gunload", builder -> builder.codec(Codec.INT));
+
+    private static <T> ComponentType<T> register(String id, UnaryOperator<ComponentType.Builder<T>> builderOperator) {
+        ComponentType<T> componentType = Registry.register(
+                Registries.DATA_COMPONENT_TYPE,
+                id,
+                builderOperator.apply(ComponentType.builder()).build()
+        );
+        PolymerComponent.registerDataComponent(componentType);
+        return componentType;
+    }
+}

src/main/java/systems/brn/plasticgun/lib/SimpleItem.java

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+package systems.brn.plasticgun.lib;
+
+import eu.pb4.polymer.core.api.item.PolymerItem;
+import eu.pb4.polymer.core.api.item.SimplePolymerItem;
+import eu.pb4.polymer.resourcepack.api.PolymerModelData;
+import eu.pb4.polymer.resourcepack.api.PolymerResourcePackUtils;
+import net.minecraft.item.*;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.util.Identifier;
+import org.jetbrains.annotations.Nullable;
+
+public abstract class SimpleItem extends SimplePolymerItem implements PolymerItem {
+    private final PolymerModelData polymerModel;
+    protected final Identifier identifier;
+
+    public SimpleItem(Settings settings, Identifier identifier) {
+        super(settings, Items.BARRIER);
+        this.identifier = identifier;
+        this.polymerModel = PolymerResourcePackUtils.requestModel(Items.BARRIER, identifier.withPath("item/" + identifier.getPath()));
+    }
+
+    @Override
+    public Item getPolymerItem(ItemStack itemStack, @Nullable ServerPlayerEntity player) {
+        return this.polymerModel.item();
+    }
+
+    @Override
+    public int getPolymerCustomModelData(ItemStack itemStack, @Nullable ServerPlayerEntity player) {
+        return this.polymerModel.value();
+    }
+
+}

src/main/java/systems/brn/plasticgun/lib/Util.java

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+package systems.brn.plasticgun.lib;
+
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.util.Identifier;
+
+import java.util.ArrayList;
+
+import static systems.brn.plasticgun.PlasticGun.MOD_ID;
+
+public class Util {
+
+    public static Identifier id(String path) {
+        return Identifier.of(MOD_ID, path);
+    }
+
+    public static ItemStack findBulletStack(ArrayList<Item> bulletItem, ServerPlayerEntity player) {
+        if (bulletItem == null || bulletItem.isEmpty()) {
+            return ItemStack.EMPTY;
+        }
+        for (ItemStack itemStack : player.getInventory().main) {
+            for (Item item : bulletItem) {
+                if (item == itemStack.getItem()) {
+                    return itemStack;
+                }
+            }
+        }
+        return ItemStack.EMPTY;
+    }
+}