ECS guns (#6229)

Co-authored-by: ShadowCommander <10494922+ShadowCommander@users.noreply.github.com>

Content.Client/Weapons/Ranged/GunSystem.AmmoCounter.cs

@@ -0,0 +1,31 @@
+using Content.Client.Weapons.Ranged.Barrels.Components;
+using Content.Shared.Weapons.Ranged;
+using Robust.Client.Player;
+using Robust.Shared.Containers;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+
+namespace Content.Client.Weapons.Ranged;
+
+public sealed class GunSystem : EntitySystem
+{
+    [Dependency] private readonly IPlayerManager _playerManager = default!;
+    [Dependency] private readonly SharedContainerSystem _container = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeNetworkEvent<MagazineAutoEjectEvent>(OnMagAutoEject);
+    }
+
+    private void OnMagAutoEject(MagazineAutoEjectEvent ev)
+    {
+        var player = _playerManager.LocalPlayer?.ControlledEntity;
+
+        if (!TryComp(ev.Uid, out ClientMagazineBarrelComponent? mag) ||
+            !_container.TryGetContainingContainer(ev.Uid, out var container) ||
+            container.Owner != player) return;
+
+        mag.PlayAlarmAnimation();
+    }
+}