diff --git a/Content.Shared/Mech/EntitySystem/SharedMechSystem.cs b/Content.Shared/Mech/EntitySystem/SharedMechSystem.cs
new file mode 100644
index 00000000000..97242973152
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+++ b/Content.Shared/Mech/EntitySystem/SharedMechSystem.cs
@@ -0,0 +1,490 @@
+using System.Linq;
+using Content.Shared.Access.Components;
+using Content.Shared.ActionBlocker;
+using Content.Shared.Actions;
+using Content.Shared.Destructible;
+using Content.Shared.DoAfter;
+using Content.Shared.DragDrop;
+using Content.Shared.Emag.Components;
+using Content.Shared.Emag.Systems;
+using Content.Shared.FixedPoint;
+using Content.Shared.Interaction;
+using Content.Shared.Interaction.Components;
+using Content.Shared.Interaction.Events;
+using Content.Shared.Mech.Components;
+using Content.Shared.Mech.Equipment.Components;
+using Content.Shared.Movement.Components;
+using Content.Shared.Movement.Systems;
+using Content.Shared.Popups;
+using Content.Shared.Weapons.Melee;
+using Content.Shared.Weapons.Ranged.Events;
+using Content.Shared.Whitelist;
+using Robust.Shared.Containers;
+using Robust.Shared.Network;
+using Robust.Shared.Serialization;
+using Robust.Shared.Timing;
+
+namespace Content.Shared.Mech.EntitySystems;
+
+/// <summary>
+/// Handles all of the interactions, UI handling, and items shennanigans for <see cref="MechComponent"/>
+/// </summary>
+public abstract class SharedMechSystem : EntitySystem
+{
+    [Dependency] private readonly IGameTiming _timing = default!;
+    [Dependency] private readonly INetManager _net = default!;
+    [Dependency] private readonly ActionBlockerSystem _actionBlocker = default!;
+    [Dependency] private readonly SharedActionsSystem _actions = default!;
+    [Dependency] private readonly SharedAppearanceSystem _appearance = default!;
+    [Dependency] private readonly SharedContainerSystem _container = default!;
+    [Dependency] private readonly SharedInteractionSystem _interaction = default!;
+    [Dependency] private readonly SharedMoverController _mover = default!;
+    [Dependency] private readonly SharedPopupSystem _popup = default!;
+    [Dependency] private readonly SharedDoAfterSystem _doAfter = default!;
+    [Dependency] private readonly EntityWhitelistSystem _whitelistSystem = default!;
+
+    /// <inheritdoc/>
+    public override void Initialize()
+    {
+        SubscribeLocalEvent<MechComponent, MechToggleEquipmentEvent>(OnToggleEquipmentAction);
+        SubscribeLocalEvent<MechComponent, MechEjectPilotEvent>(OnEjectPilotEvent);
+        SubscribeLocalEvent<MechComponent, UserActivateInWorldEvent>(RelayInteractionEvent);
+        SubscribeLocalEvent<MechComponent, ComponentStartup>(OnStartup);
+        SubscribeLocalEvent<MechComponent, DestructionEventArgs>(OnDestruction);
+        SubscribeLocalEvent<MechComponent, GetAdditionalAccessEvent>(OnGetAdditionalAccess);
+        SubscribeLocalEvent<MechComponent, DragDropTargetEvent>(OnDragDrop);
+        SubscribeLocalEvent<MechComponent, CanDropTargetEvent>(OnCanDragDrop);
+        SubscribeLocalEvent<MechComponent, GotEmaggedEvent>(OnEmagged);
+
+        SubscribeLocalEvent<MechPilotComponent, GetMeleeWeaponEvent>(OnGetMeleeWeapon);
+        SubscribeLocalEvent<MechPilotComponent, CanAttackFromContainerEvent>(OnCanAttackFromContainer);
+        SubscribeLocalEvent<MechPilotComponent, AttackAttemptEvent>(OnAttackAttempt);
+    }
+
+    private void OnToggleEquipmentAction(EntityUid uid, MechComponent component, MechToggleEquipmentEvent args)
+    {
+        if (args.Handled)
+            return;
+        args.Handled = true;
+        CycleEquipment(uid);
+    }
+
+    private void OnEjectPilotEvent(EntityUid uid, MechComponent component, MechEjectPilotEvent args)
+    {
+        if (args.Handled)
+            return;
+        args.Handled = true;
+        TryEject(uid, component);
+    }
+
+    private void RelayInteractionEvent(EntityUid uid, MechComponent component, UserActivateInWorldEvent args)
+    {
+        var pilot = component.PilotSlot.ContainedEntity;
+        if (pilot == null)
+            return;
+
+        // TODO why is this being blocked?
+        if (!_timing.IsFirstTimePredicted)
+            return;
+
+        if (component.CurrentSelectedEquipment != null)
+        {
+            RaiseLocalEvent(component.CurrentSelectedEquipment.Value, args);
+        }
+    }
+
+    private void OnStartup(EntityUid uid, MechComponent component, ComponentStartup args)
+    {
+        component.PilotSlot = _container.EnsureContainer<ContainerSlot>(uid, component.PilotSlotId);
+        component.EquipmentContainer = _container.EnsureContainer<Container>(uid, component.EquipmentContainerId);
+        component.BatterySlot = _container.EnsureContainer<ContainerSlot>(uid, component.BatterySlotId);
+        UpdateAppearance(uid, component);
+    }
+
+    private void OnDestruction(EntityUid uid, MechComponent component, DestructionEventArgs args)
+    {
+        BreakMech(uid, component);
+    }
+
+    private void OnGetAdditionalAccess(EntityUid uid, MechComponent component, ref GetAdditionalAccessEvent args)
+    {
+        var pilot = component.PilotSlot.ContainedEntity;
+        if (pilot == null)
+            return;
+
+        args.Entities.Add(pilot.Value);
+    }
+
+    private void SetupUser(EntityUid mech, EntityUid pilot, MechComponent? component = null)
+    {
+        if (!Resolve(mech, ref component))
+            return;
+
+        var rider = EnsureComp<MechPilotComponent>(pilot);
+
+        // Warning: this bypasses most normal interaction blocking components on the user, like drone laws and the like.
+        var irelay = EnsureComp<InteractionRelayComponent>(pilot);
+
+        _mover.SetRelay(pilot, mech);
+        _interaction.SetRelay(pilot, mech, irelay);
+        rider.Mech = mech;
+        Dirty(pilot, rider);
+
+        if (_net.IsClient)
+            return;
+
+        _actions.AddAction(pilot, ref component.MechCycleActionEntity, component.MechCycleAction, mech);
+        _actions.AddAction(pilot, ref component.MechUiActionEntity, component.MechUiAction, mech);
+        _actions.AddAction(pilot, ref component.MechEjectActionEntity, component.MechEjectAction, mech);
+    }
+
+    private void RemoveUser(EntityUid mech, EntityUid pilot)
+    {
+        if (!RemComp<MechPilotComponent>(pilot))
+            return;
+        RemComp<RelayInputMoverComponent>(pilot);
+        RemComp<InteractionRelayComponent>(pilot);
+
+        _actions.RemoveProvidedActions(pilot, mech);
+    }
+
+    /// <summary>
+    /// Destroys the mech, removing the user and ejecting all installed equipment.
+    /// </summary>
+    /// <param name="uid"></param>
+    /// <param name="component"></param>
+    public virtual void BreakMech(EntityUid uid, MechComponent? component = null)
+    {
+        if (!Resolve(uid, ref component))
+            return;
+
+        TryEject(uid, component);
+        var equipment = new List<EntityUid>(component.EquipmentContainer.ContainedEntities);
+        foreach (var ent in equipment)
+        {
+            RemoveEquipment(uid, ent, component, forced: true);
+        }
+
+        component.Broken = true;
+        UpdateAppearance(uid, component);
+    }
+
+    /// <summary>
+    /// Cycles through the currently selected equipment.
+    /// </summary>
+    /// <param name="uid"></param>
+    /// <param name="component"></param>
+    public void CycleEquipment(EntityUid uid, MechComponent? component = null)
+    {
+        if (!Resolve(uid, ref component))
+            return;
+
+        var allEquipment = component.EquipmentContainer.ContainedEntities.ToList();
+
+        var equipmentIndex = -1;
+        if (component.CurrentSelectedEquipment != null)
+        {
+            bool StartIndex(EntityUid u) => u == component.CurrentSelectedEquipment;
+            equipmentIndex = allEquipment.FindIndex(StartIndex);
+        }
+
+        equipmentIndex++;
+        component.CurrentSelectedEquipment = equipmentIndex >= allEquipment.Count
+            ? null
+            : allEquipment[equipmentIndex];
+
+        var popupString = component.CurrentSelectedEquipment != null
+            ? Loc.GetString("mech-equipment-select-popup", ("item", component.CurrentSelectedEquipment))
+            : Loc.GetString("mech-equipment-select-none-popup");
+
+        if (_net.IsServer)
+            _popup.PopupEntity(popupString, uid);
+
+        Dirty(uid, component);
+    }
+
+    /// <summary>
+    /// Inserts an equipment item into the mech.
+    /// </summary>
+    /// <param name="uid"></param>
+    /// <param name="toInsert"></param>
+    /// <param name="component"></param>
+    /// <param name="equipmentComponent"></param>
+    public void InsertEquipment(EntityUid uid, EntityUid toInsert, MechComponent? component = null,
+        MechEquipmentComponent? equipmentComponent = null)
+    {
+        if (!Resolve(uid, ref component))
+            return;
+
+        if (!Resolve(toInsert, ref equipmentComponent))
+            return;
+
+        if (component.EquipmentContainer.ContainedEntities.Count >= component.MaxEquipmentAmount)
+            return;
+
+        if (_whitelistSystem.IsWhitelistFail(component.EquipmentWhitelist, toInsert))
+            return;
+
+        equipmentComponent.EquipmentOwner = uid;
+        _container.Insert(toInsert, component.EquipmentContainer);
+        var ev = new MechEquipmentInsertedEvent(uid);
+        RaiseLocalEvent(toInsert, ref ev);
+        UpdateUserInterface(uid, component);
+    }
+
+    /// <summary>
+    /// Removes an equipment item from a mech.
+    /// </summary>
+    /// <param name="uid"></param>
+    /// <param name="toRemove"></param>
+    /// <param name="component"></param>
+    /// <param name="equipmentComponent"></param>
+    /// <param name="forced">Whether or not the removal can be cancelled</param>
+    public void RemoveEquipment(EntityUid uid, EntityUid toRemove, MechComponent? component = null,
+        MechEquipmentComponent? equipmentComponent = null, bool forced = false)
+    {
+        if (!Resolve(uid, ref component))
+            return;
+
+        if (!Resolve(toRemove, ref equipmentComponent))
+            return;
+
+        if (!forced)
+        {
+            var attemptev = new AttemptRemoveMechEquipmentEvent();
+            RaiseLocalEvent(toRemove, ref attemptev);
+            if (attemptev.Cancelled)
+                return;
+        }
+
+        var ev = new MechEquipmentRemovedEvent(uid);
+        RaiseLocalEvent(toRemove, ref ev);
+
+        if (component.CurrentSelectedEquipment == toRemove)
+            CycleEquipment(uid, component);
+
+        equipmentComponent.EquipmentOwner = null;
+        _container.Remove(toRemove, component.EquipmentContainer);
+        UpdateUserInterface(uid, component);
+    }
+
+    /// <summary>
+    /// Attempts to change the amount of energy in the mech.
+    /// </summary>
+    /// <param name="uid">The mech itself</param>
+    /// <param name="delta">The change in energy</param>
+    /// <param name="component"></param>
+    /// <returns>If the energy was successfully changed.</returns>
+    public virtual bool TryChangeEnergy(EntityUid uid, FixedPoint2 delta, MechComponent? component = null)
+    {
+        if (!Resolve(uid, ref component))
+            return false;
+
+        if (component.Energy + delta < 0)
+            return false;
+
+        component.Energy = FixedPoint2.Clamp(component.Energy + delta, 0, component.MaxEnergy);
+        Dirty(uid, component);
+        UpdateUserInterface(uid, component);
+        return true;
+    }
+
+    /// <summary>
+    /// Sets the integrity of the mech.
+    /// </summary>
+    /// <param name="uid">The mech itself</param>
+    /// <param name="value">The value the integrity will be set at</param>
+    /// <param name="component"></param>
+    public void SetIntegrity(EntityUid uid, FixedPoint2 value, MechComponent? component = null)
+    {
+        if (!Resolve(uid, ref component))
+            return;
+
+        component.Integrity = FixedPoint2.Clamp(value, 0, component.MaxIntegrity);
+
+        if (component.Integrity <= 0)
+        {
+            BreakMech(uid, component);
+        }
+        else if (component.Broken)
+        {
+            component.Broken = false;
+            UpdateAppearance(uid, component);
+        }
+
+        Dirty(uid, component);
+        UpdateUserInterface(uid, component);
+    }
+
+    /// <summary>
+    /// Checks if the pilot is present
+    /// </summary>
+    /// <param name="component"></param>
+    /// <returns>Whether or not the pilot is present</returns>
+    public bool IsEmpty(MechComponent component)
+    {
+        return component.PilotSlot.ContainedEntity == null;
+    }
+
+    /// <summary>
+    /// Checks if an entity can be inserted into the mech.
+    /// </summary>
+    /// <param name="uid"></param>
+    /// <param name="toInsert"></param>
+    /// <param name="component"></param>
+    /// <returns></returns>
+    public bool CanInsert(EntityUid uid, EntityUid toInsert, MechComponent? component = null)
+    {
+        if (!Resolve(uid, ref component))
+            return false;
+
+        return IsEmpty(component) && _actionBlocker.CanMove(toInsert);
+    }
+
+    /// <summary>
+    /// Updates the user interface
+    /// </summary>
+    /// <remarks>
+    /// This is defined here so that UI updates can be accessed from shared.
+    /// </remarks>
+    public virtual void UpdateUserInterface(EntityUid uid, MechComponent? component = null)
+    {
+    }
+
+    /// <summary>
+    /// Attempts to insert a pilot into the mech.
+    /// </summary>
+    /// <param name="uid"></param>
+    /// <param name="toInsert"></param>
+    /// <param name="component"></param>
+    /// <returns>Whether or not the entity was inserted</returns>
+    public bool TryInsert(EntityUid uid, EntityUid? toInsert, MechComponent? component = null)
+    {
+        if (!Resolve(uid, ref component))
+            return false;
+
+        if (toInsert == null || component.PilotSlot.ContainedEntity == toInsert)
+            return false;
+
+        if (!CanInsert(uid, toInsert.Value, component))
+            return false;
+
+        SetupUser(uid, toInsert.Value);
+        _container.Insert(toInsert.Value, component.PilotSlot);
+        UpdateAppearance(uid, component);
+        return true;
+    }
+
+    /// <summary>
+    /// Attempts to eject the current pilot from the mech
+    /// </summary>
+    /// <param name="uid"></param>
+    /// <param name="component"></param>
+    /// <returns>Whether or not the pilot was ejected.</returns>
+    public bool TryEject(EntityUid uid, MechComponent? component = null)
+    {
+        if (!Resolve(uid, ref component))
+            return false;
+
+        if (component.PilotSlot.ContainedEntity == null)
+            return false;
+
+        var pilot = component.PilotSlot.ContainedEntity.Value;
+
+        RemoveUser(uid, pilot);
+        _container.RemoveEntity(uid, pilot);
+        UpdateAppearance(uid, component);
+        return true;
+    }
+
+    private void OnGetMeleeWeapon(EntityUid uid, MechPilotComponent component, GetMeleeWeaponEvent args)
+    {
+        if (args.Handled)
+            return;
+
+        if (!TryComp<MechComponent>(component.Mech, out var mech))
+            return;
+
+        var weapon = mech.CurrentSelectedEquipment ?? component.Mech;
+        args.Weapon = weapon;
+        args.Handled = true;
+    }
+
+    private void OnCanAttackFromContainer(EntityUid uid, MechPilotComponent component, CanAttackFromContainerEvent args)
+    {
+        args.CanAttack = true;
+    }
+
+    private void OnAttackAttempt(EntityUid uid, MechPilotComponent component, AttackAttemptEvent args)
+    {
+        if (args.Target == component.Mech)
+            args.Cancel();
+    }
+
+    private void UpdateAppearance(EntityUid uid, MechComponent? component = null,
+        AppearanceComponent? appearance = null)
+    {
+        if (!Resolve(uid, ref component, ref appearance, false))
+            return;
+
+        _appearance.SetData(uid, MechVisuals.Open, IsEmpty(component), appearance);
+        _appearance.SetData(uid, MechVisuals.Broken, component.Broken, appearance);
+    }
+
+    private void OnDragDrop(EntityUid uid, MechComponent component, ref DragDropTargetEvent args)
+    {
+        if (args.Handled)
+            return;
+
+        args.Handled = true;
+
+        var doAfterEventArgs = new DoAfterArgs(EntityManager, args.Dragged, component.EntryDelay, new MechEntryEvent(), uid, target: uid)
+        {
+            BreakOnMove = true,
+        };
+
+        _doAfter.TryStartDoAfter(doAfterEventArgs);
+    }
+
+    private void OnCanDragDrop(EntityUid uid, MechComponent component, ref CanDropTargetEvent args)
+    {
+        args.Handled = true;
+
+        args.CanDrop |= !component.Broken && CanInsert(uid, args.Dragged, component);
+    }
+
+    private void OnEmagged(EntityUid uid, MechComponent component, ref GotEmaggedEvent args)
+    {
+        if (!component.BreakOnEmag)
+            return;
+        args.Handled = true;
+        component.EquipmentWhitelist = null;
+        Dirty(uid, component);
+    }
+}
+
+/// <summary>
+///     Event raised when the battery is successfully removed from the mech,
+///     on both success and failure
+/// </summary>
+[Serializable, NetSerializable]
+public sealed partial class RemoveBatteryEvent : SimpleDoAfterEvent
+{
+}
+
+/// <summary>
+///     Event raised when a person removes someone from a mech,
+///     on both success and failure
+/// </summary>
+[Serializable, NetSerializable]
+public sealed partial class MechExitEvent : SimpleDoAfterEvent
+{
+}
+
+/// <summary>
+///     Event raised when a person enters a mech, on both success and failure
+/// </summary>
+[Serializable, NetSerializable]
+public sealed partial class MechEntryEvent : SimpleDoAfterEvent
+{
+}