diff --git a/src/abilities/mod.rs b/src/abilities/mod.rs
index 07fc651..6a79a3d 100644
--- a/src/abilities/mod.rs
+++ b/src/abilities/mod.rs
@@ -114,11 +114,15 @@ fn on_trigger_state(
     mut commands: Commands,
     player_rot: Query<&Transform, With<PlayerBodyMesh>>,
     player_query: Query<(&Transform, &AimTarget), With<Player>>,
-    mut active_heads: ResMut<ActiveHeads>,
+    mut active_heads: Query<&mut ActiveHeads, With<Player>>,
     heads_db: Res<HeadsDatabase>,
     time: Res<Time>,
 ) {
     if matches!(trigger.event(), TriggerState::Active) {
+        let Ok(mut active_heads) = active_heads.get_single_mut() else {
+            return;
+        };
+
         let Some(state) = active_heads.current() else {
             return;
         };
diff --git a/src/ai/mod.rs b/src/ai/mod.rs
index 8225f79..fe175e2 100644
--- a/src/ai/mod.rs
+++ b/src/ai/mod.rs
@@ -4,8 +4,8 @@ use crate::{
     GameState,
     abilities::{HeadAbility, TriggerData, TriggerThrow},
     aim::AimTarget,
+    heads::ActiveHeads,
     heads_database::HeadsDatabase,
-    npc::Npc,
 };
 
 #[derive(Component, Reflect)]
@@ -18,7 +18,7 @@ pub fn plugin(app: &mut App) {
 
 fn update(
     mut commands: Commands,
-    mut query: Query<(&mut Npc, &AimTarget, &Transform), With<Ai>>,
+    mut query: Query<(&mut ActiveHeads, &AimTarget, &Transform), With<Ai>>,
     time: Res<Time>,
     heads_db: Res<HeadsDatabase>,
 ) {
@@ -27,18 +27,21 @@ fn update(
             continue;
         }
 
-        let ability = heads_db.head_stats(npc.head).ability;
+        let Some(npc_head) = npc.current() else {
+            continue;
+        };
+
+        let ability = heads_db.head_stats(npc_head.head).ability;
 
         //TODO: support other abilities
         if ability != HeadAbility::Thrown {
             continue;
         }
 
-        let can_shoot_again = npc.last_use + 1. < time.elapsed_secs();
+        let can_shoot_again = npc_head.last_use + 1. < time.elapsed_secs();
 
-        if can_shoot_again && npc.has_ammo() {
-            npc.last_use = time.elapsed_secs();
-            npc.ammo -= 1;
+        if can_shoot_again && npc_head.has_ammo() {
+            npc.use_ammo(time.elapsed_secs());
 
             let dir = t.forward();
 
@@ -48,7 +51,7 @@ fn update(
                 t.rotation,
                 t.translation,
                 crate::physics_layers::GameLayer::Player,
-                npc.head,
+                npc_head.head,
             )));
         }
     }
diff --git a/src/aim/target_ui.rs b/src/aim/target_ui.rs
index 5c439fe..d860a89 100644
--- a/src/aim/target_ui.rs
+++ b/src/aim/target_ui.rs
@@ -1,7 +1,12 @@
 use super::AimTarget;
 use crate::{
-    GameState, backpack::UiHeadState, heads::HeadsImages, hitpoints::Hitpoints,
-    loading_assets::UIAssets, npc::Npc, player::Player,
+    GameState,
+    backpack::UiHeadState,
+    heads::{ActiveHeads, HeadsImages},
+    hitpoints::Hitpoints,
+    loading_assets::UIAssets,
+    npc::Npc,
+    player::Player,
 };
 use bevy::prelude::*;
 
@@ -142,11 +147,12 @@ fn update(
 fn sync(
     mut target: ResMut<TargetUi>,
     player_target: Query<&AimTarget, With<Player>>,
-    target_data: Query<(&Hitpoints, &Npc)>,
+    target_data: Query<(&Hitpoints, &ActiveHeads), With<Npc>>,
 ) {
     let mut new_state = None;
     if let Some(e) = player_target.iter().next().and_then(|target| target.0) {
-        if let Ok((hp, head)) = target_data.get(e) {
+        if let Ok((hp, heads)) = target_data.get(e) {
+            let head = heads.current().expect("target must have a head on");
             new_state = Some(UiHeadState {
                 head: head.head,
                 health: hp.health(),
diff --git a/src/heads/heads_ui.rs b/src/heads/heads_ui.rs
index 402da31..b853fdc 100644
--- a/src/heads/heads_ui.rs
+++ b/src/heads/heads_ui.rs
@@ -1,4 +1,4 @@
-use crate::{GameState, backpack::UiHeadState, loading_assets::UIAssets};
+use crate::{GameState, backpack::UiHeadState, loading_assets::UIAssets, player::Player};
 use bevy::prelude::*;
 use bevy_ui_gradients::{AngularColorStop, BackgroundGradient, ConicGradient, Gradient, Position};
 use std::f32::consts::PI;
@@ -213,11 +213,19 @@ fn update_health(res: Res<UiActiveHeads>, mut query: Query<(&mut Node, &HeadDama
     }
 }
 
-fn sync(active: Res<ActiveHeads>, mut state: ResMut<UiActiveHeads>, time: Res<Time>) {
-    if active.is_changed() || active.reloading() {
-        state.current_slot = active.slot();
+fn sync(
+    active_heads: Query<Ref<ActiveHeads>, With<Player>>,
+    mut state: ResMut<UiActiveHeads>,
+    time: Res<Time>,
+) {
+    let Ok(active_heads) = active_heads.get_single() else {
+        return;
+    };
+
+    if active_heads.is_changed() || active_heads.reloading() {
+        state.current_slot = active_heads.slot();
         for i in 0..HEAD_SLOTS {
-            state.heads[i] = active
+            state.heads[i] = active_heads
                 .head(i)
                 .map(|state| UiHeadState::new(state, time.elapsed_secs()));
         }
diff --git a/src/heads/mod.rs b/src/heads/mod.rs
index 487cf30..908a5c8 100644
--- a/src/heads/mod.rs
+++ b/src/heads/mod.rs
@@ -48,14 +48,21 @@ impl HeadState {
     }
 }
 
-#[derive(Resource, Default, Reflect)]
-#[reflect(Resource)]
+#[derive(Component, Default, Reflect, Debug)]
+#[reflect(Component)]
 pub struct ActiveHeads {
     heads: [Option<HeadState>; 5],
     current_slot: usize,
 }
 
 impl ActiveHeads {
+    pub fn new(heads: [Option<HeadState>; 5]) -> Self {
+        Self {
+            heads,
+            current_slot: 0,
+        }
+    }
+
     pub fn current(&self) -> Option<HeadState> {
         self.heads[self.current_slot]
     }
@@ -80,7 +87,11 @@ impl ActiveHeads {
 
     pub fn reloading(&self) -> bool {
         for head in self.heads {
-            if head.map(|head| head.ammo == 0).unwrap_or(false) {
+            let Some(head) = head else {
+                continue;
+            };
+
+            if head.ammo == 0 {
                 return true;
             }
         }
@@ -88,6 +99,14 @@ impl ActiveHeads {
         false
     }
 
+    pub fn hp(&self) -> Hitpoints {
+        if let Some(head) = &self.heads[self.current_slot] {
+            Hitpoints::new(head.health_max).with_health(head.health)
+        } else {
+            Hitpoints::new(0)
+        }
+    }
+
     pub fn set_hitpoint(&mut self, hp: &Hitpoints) {
         let Some(head) = &mut self.heads[self.current_slot] else {
             error!("cannot use ammo of empty head");
@@ -110,17 +129,6 @@ pub struct HeadChanged(pub usize);
 pub fn plugin(app: &mut App) {
     app.add_plugins(heads_ui::plugin);
 
-    app.insert_resource(ActiveHeads {
-        heads: [
-            Some(HeadState::new(0, 10)),
-            Some(HeadState::new(3, 10)),
-            Some(HeadState::new(6, 10)),
-            Some(HeadState::new(8, 10)),
-            Some(HeadState::new(9, 10)),
-        ],
-        current_slot: 0,
-    });
-
     app.add_systems(OnEnter(GameState::Playing), setup);
     app.add_systems(
         Update,
@@ -140,27 +148,30 @@ fn setup(mut commands: Commands, asset_server: Res<AssetServer>, heads: Res<Head
     commands.insert_resource(HeadsImages { heads });
 }
 
-fn sync_hp(mut active: ResMut<ActiveHeads>, query: Query<&Hitpoints, With<Player>>) {
-    let Ok(hp) = query.get_single() else {
-        return;
-    };
-
-    active.set_hitpoint(hp);
+fn sync_hp(mut query: Query<(&mut ActiveHeads, &Hitpoints)>) {
+    for (mut active_heads, hp) in query.iter_mut() {
+        if active_heads.hp() != *hp {
+            active_heads.set_hitpoint(hp);
+        }
+    }
 }
 
-fn reload(mut commands: Commands, mut active: ResMut<ActiveHeads>, time: Res<Time>) {
-    if !active.reloading() {
-        return;
-    }
-
-    for head in active.heads.iter_mut() {
-        let Some(head) = head else {
+fn reload(mut commands: Commands, mut active: Query<&mut ActiveHeads>, time: Res<Time>) {
+    for mut active in active.iter_mut() {
+        if !active.reloading() {
             continue;
-        };
+        }
 
-        if !head.has_ammo() && (head.last_use + head.reload_duration <= time.elapsed_secs()) {
-            commands.trigger(PlaySound::Reloaded);
-            head.ammo = head.ammo_max;
+        for head in active.heads.iter_mut() {
+            let Some(head) = head else {
+                continue;
+            };
+
+            if !head.has_ammo() && (head.last_use + head.reload_duration <= time.elapsed_secs()) {
+                // only for player?
+                commands.trigger(PlaySound::Reloaded);
+                head.ammo = head.ammo_max;
+            }
         }
     }
 }
@@ -168,43 +179,47 @@ fn reload(mut commands: Commands, mut active: ResMut<ActiveHeads>, time: Res<Tim
 fn on_select_active_head(
     trigger: Trigger<SelectActiveHead>,
     mut commands: Commands,
-    mut res: ResMut<ActiveHeads>,
-    mut query: Query<&mut Hitpoints, With<Player>>,
+    mut query: Query<(&mut ActiveHeads, &mut Hitpoints), With<Player>>,
 ) {
+    let Ok((mut active_heads, mut hp)) = query.get_single_mut() else {
+        return;
+    };
+
     match trigger.event() {
         SelectActiveHead::Right => {
-            res.current_slot = (res.current_slot + 1) % HEAD_SLOTS;
+            active_heads.current_slot = (active_heads.current_slot + 1) % HEAD_SLOTS;
         }
         SelectActiveHead::Left => {
-            res.current_slot = (res.current_slot + (HEAD_SLOTS - 1)) % HEAD_SLOTS;
+            active_heads.current_slot = (active_heads.current_slot + (HEAD_SLOTS - 1)) % HEAD_SLOTS;
         }
     }
 
-    // sync health back into Hitpoints
-    let Ok(mut hp) = query.get_single_mut() else {
-        return;
-    };
-    hp.set_health(res.current().unwrap().health);
+    hp.set_health(active_heads.current().unwrap().health);
 
     commands.trigger(PlaySound::Selection);
-    commands.trigger(HeadChanged(res.heads[res.current_slot].unwrap().head));
+    commands.trigger(HeadChanged(
+        active_heads.heads[active_heads.current_slot].unwrap().head,
+    ));
 }
 
 fn on_swap_backpack(
     trigger: Trigger<BackbackSwapEvent>,
     mut commands: Commands,
-    mut res: ResMut<ActiveHeads>,
+    mut query: Query<(&mut ActiveHeads, &mut Hitpoints), With<Player>>,
     mut backpack: ResMut<Backpack>,
-    mut query: Query<&mut Hitpoints, With<Player>>,
 ) {
     let backpack_slot = trigger.event().0;
 
     let head = backpack.heads.get(backpack_slot).unwrap();
 
-    let current_active_slot = res.current_slot;
+    let Ok((mut active_heads, mut hp)) = query.get_single_mut() else {
+        return;
+    };
 
-    let current_active_head = res.heads[current_active_slot];
-    res.heads[current_active_slot] = Some(*head);
+    let current_active_slot = active_heads.current_slot;
+
+    let current_active_head = active_heads.heads[current_active_slot];
+    active_heads.heads[current_active_slot] = Some(*head);
 
     if let Some(old_active) = current_active_head {
         backpack.heads[backpack_slot] = old_active;
@@ -212,11 +227,9 @@ fn on_swap_backpack(
         backpack.heads.remove(backpack_slot);
     }
 
-    // sync health back into Hitpoints
-    let Ok(mut hp) = query.get_single_mut() else {
-        return;
-    };
-    hp.set_health(res.current().unwrap().health);
+    hp.set_health(active_heads.current().unwrap().health);
 
-    commands.trigger(HeadChanged(res.heads[res.current_slot].unwrap().head));
+    commands.trigger(HeadChanged(
+        active_heads.heads[active_heads.current_slot].unwrap().head,
+    ));
 }
diff --git a/src/hitpoints.rs b/src/hitpoints.rs
index f10364f..a099ff9 100644
--- a/src/hitpoints.rs
+++ b/src/hitpoints.rs
@@ -10,7 +10,7 @@ pub struct Hit {
     pub damage: u32,
 }
 
-#[derive(Component, Reflect, Debug)]
+#[derive(Component, Reflect, Debug, PartialEq, Eq, Clone, Copy)]
 pub struct Hitpoints {
     max: u32,
     current: u32,
@@ -21,6 +21,11 @@ impl Hitpoints {
         Self { max: v, current: v }
     }
 
+    pub fn with_health(mut self, v: u32) -> Self {
+        self.current = v;
+        self
+    }
+
     pub fn health(&self) -> f32 {
         self.current as f32 / self.max as f32
     }
diff --git a/src/npc.rs b/src/npc.rs
index bc1847a..997a873 100644
--- a/src/npc.rs
+++ b/src/npc.rs
@@ -2,7 +2,7 @@ use crate::{
     GameState,
     ai::Ai,
     head::ActiveHead,
-    heads::{HEAD_COUNT, HeadState},
+    heads::{ActiveHeads, HEAD_COUNT, HeadState},
     heads_database::HeadsDatabase,
     hitpoints::{Hitpoints, Kill},
     keys::KeySpawn,
@@ -11,9 +11,9 @@ use crate::{
 use bevy::prelude::*;
 use std::collections::HashMap;
 
-#[derive(Component, Reflect, Deref, DerefMut)]
+#[derive(Component, Reflect)]
 #[reflect(Component)]
-pub struct Npc(HeadState);
+pub struct Npc;
 
 pub fn plugin(app: &mut App) {
     app.add_systems(OnEnter(GameState::Playing), init);
@@ -32,8 +32,9 @@ fn init(mut commands: Commands, query: Query<(Entity, &EnemySpawn)>, heads_db: R
             .entity(e)
             .insert((
                 Hitpoints::new(100),
-                Npc(HeadState::new(id, 10)),
+                Npc,
                 ActiveHead(id),
+                ActiveHeads::new([Some(HeadState::new(id, 10)), None, None, None, None]),
                 Ai,
             ))
             .observe(on_kill);
diff --git a/src/player.rs b/src/player.rs
index cbc584b..12d69be 100644
--- a/src/player.rs
+++ b/src/player.rs
@@ -6,7 +6,7 @@ use crate::{
     control::controller_common::{CharacterControllerBundle, PlayerMovement},
     global_observer,
     head::ActiveHead,
-    heads::HeadChanged,
+    heads::{ActiveHeads, HeadChanged, HeadState},
     heads_database::{HeadControls, HeadsDatabase},
     hitpoints::Hitpoints,
     loading_assets::{AudioAssets, GameAssets},
@@ -75,6 +75,13 @@ fn spawn(
             Name::from("player"),
             Player,
             ActiveHead(0),
+            ActiveHeads::new([
+                Some(HeadState::new(0, 10)),
+                Some(HeadState::new(3, 10)),
+                Some(HeadState::new(6, 10)),
+                Some(HeadState::new(8, 10)),
+                Some(HeadState::new(9, 10)),
+            ]),
             Hitpoints::new(100),
             CameraTarget,
             transform,