diff --git a/app/models/grid_artifact.rb b/app/models/grid_artifact.rb
index e6ef66f..156ca23 100644
--- a/app/models/grid_artifact.rb
+++ b/app/models/grid_artifact.rb
@@ -6,6 +6,7 @@ class GridArtifact < ApplicationRecord
   # Associations
   belongs_to :grid_character
   belongs_to :artifact
+  belongs_to :collection_artifact, optional: true
 
   has_one :party, through: :grid_character
   has_one :character, through: :grid_character
@@ -54,6 +55,47 @@ class GridArtifact < ApplicationRecord
     quirk_artifact? ? proficiency : artifact&.proficiency
   end
 
+  ##
+  # Syncs customizations from the linked collection artifact.
+  #
+  # @return [Boolean] true if sync was performed, false if no collection link
+  def sync_from_collection!
+    return false unless collection_artifact.present?
+
+    attrs = {
+      element: collection_artifact.element,
+      level: collection_artifact.level,
+      skill1: collection_artifact.skill1,
+      skill2: collection_artifact.skill2,
+      skill3: collection_artifact.skill3,
+      skill4: collection_artifact.skill4,
+      reroll_slot: collection_artifact.reroll_slot
+    }
+
+    # Only sync proficiency for quirk artifacts
+    attrs[:proficiency] = collection_artifact.proficiency if quirk_artifact?
+
+    update!(attrs)
+    true
+  end
+
+  ##
+  # Checks if grid artifact is out of sync with collection.
+  #
+  # @return [Boolean] true if any customization differs from collection
+  def out_of_sync?
+    return false unless collection_artifact.present?
+
+    element != collection_artifact.element ||
+      level != collection_artifact.level ||
+      skill1 != collection_artifact.skill1 ||
+      skill2 != collection_artifact.skill2 ||
+      skill3 != collection_artifact.skill3 ||
+      skill4 != collection_artifact.skill4 ||
+      reroll_slot != collection_artifact.reroll_slot ||
+      (quirk_artifact? && proficiency != collection_artifact.proficiency)
+  end
+
   private
 
   def quirk_artifact?
diff --git a/app/models/grid_character.rb b/app/models/grid_character.rb
index 0a54b17..32ea9a3 100644
--- a/app/models/grid_character.rb
+++ b/app/models/grid_character.rb
@@ -23,6 +23,7 @@ class GridCharacter < ApplicationRecord
   belongs_to :party,
              counter_cache: :characters_count,
              inverse_of: :characters
+  belongs_to :collection_character, optional: true
 
   has_one :grid_artifact, dependent: :destroy
 
@@ -188,6 +189,50 @@ class GridCharacter < ApplicationRecord
     GridCharacterBlueprint
   end
 
+  ##
+  # Syncs customizations from the linked collection character.
+  #
+  # Copies uncap level, transcendence, rings, earring, and awakening from the collection.
+  # No-op if no collection character is linked.
+  #
+  # @return [Boolean] true if sync was performed, false if no collection link
+  def sync_from_collection!
+    return false unless collection_character.present?
+
+    update!(
+      uncap_level: collection_character.uncap_level,
+      transcendence_step: collection_character.transcendence_step,
+      perpetuity: collection_character.perpetuity,
+      ring1: collection_character.ring1,
+      ring2: collection_character.ring2,
+      ring3: collection_character.ring3,
+      ring4: collection_character.ring4,
+      earring: collection_character.earring,
+      awakening_id: collection_character.awakening_id,
+      awakening_level: collection_character.awakening_level
+    )
+    true
+  end
+
+  ##
+  # Checks if grid character is out of sync with collection.
+  #
+  # @return [Boolean] true if any customization differs from collection
+  def out_of_sync?
+    return false unless collection_character.present?
+
+    uncap_level != collection_character.uncap_level ||
+      transcendence_step != collection_character.transcendence_step ||
+      perpetuity != collection_character.perpetuity ||
+      ring1 != collection_character.ring1 ||
+      ring2 != collection_character.ring2 ||
+      ring3 != collection_character.ring3 ||
+      ring4 != collection_character.ring4 ||
+      earring != collection_character.earring ||
+      awakening_id != collection_character.awakening_id ||
+      awakening_level != collection_character.awakening_level
+  end
+
   private
 
   ##
diff --git a/app/models/grid_summon.rb b/app/models/grid_summon.rb
index 16811b2..596a7ed 100644
--- a/app/models/grid_summon.rb
+++ b/app/models/grid_summon.rb
@@ -16,6 +16,7 @@ class GridSummon < ApplicationRecord
   belongs_to :party,
              counter_cache: :summons_count,
              inverse_of: :summons
+  belongs_to :collection_summon, optional: true
   validates_presence_of :party
 
   # Validate that position is provided.
@@ -39,6 +40,31 @@ class GridSummon < ApplicationRecord
     GridSummonBlueprint
   end
 
+  ##
+  # Syncs customizations from the linked collection summon.
+  #
+  # @return [Boolean] true if sync was performed, false if no collection link
+  def sync_from_collection!
+    return false unless collection_summon.present?
+
+    update!(
+      uncap_level: collection_summon.uncap_level,
+      transcendence_step: collection_summon.transcendence_step
+    )
+    true
+  end
+
+  ##
+  # Checks if grid summon is out of sync with collection.
+  #
+  # @return [Boolean] true if any customization differs from collection
+  def out_of_sync?
+    return false unless collection_summon.present?
+
+    uncap_level != collection_summon.uncap_level ||
+      transcendence_step != collection_summon.transcendence_step
+  end
+
   ##
   # Returns any conflicting grid summon for the given party.
   #
diff --git a/app/models/grid_weapon.rb b/app/models/grid_weapon.rb
index ef85d9c..73b439d 100644
--- a/app/models/grid_weapon.rb
+++ b/app/models/grid_weapon.rb
@@ -37,6 +37,7 @@ class GridWeapon < ApplicationRecord
   belongs_to :weapon_key4, class_name: 'WeaponKey', foreign_key: :weapon_key4_id, optional: true
 
   belongs_to :awakening, optional: true
+  belongs_to :collection_weapon, optional: true
 
   # Validate that uncap_level is present and numeric, transcendence_step is optional but must be numeric if present.
   validates :uncap_level, presence: true, numericality: { only_integer: true }
@@ -63,6 +64,53 @@ class GridWeapon < ApplicationRecord
     GridWeaponBlueprint
   end
 
+  ##
+  # Syncs customizations from the linked collection weapon.
+  #
+  # @return [Boolean] true if sync was performed, false if no collection link
+  def sync_from_collection!
+    return false unless collection_weapon.present?
+
+    update!(
+      uncap_level: collection_weapon.uncap_level,
+      transcendence_step: collection_weapon.transcendence_step,
+      element: collection_weapon.element,
+      weapon_key1_id: collection_weapon.weapon_key1_id,
+      weapon_key2_id: collection_weapon.weapon_key2_id,
+      weapon_key3_id: collection_weapon.weapon_key3_id,
+      weapon_key4_id: collection_weapon.weapon_key4_id,
+      ax_modifier1: collection_weapon.ax_modifier1,
+      ax_strength1: collection_weapon.ax_strength1,
+      ax_modifier2: collection_weapon.ax_modifier2,
+      ax_strength2: collection_weapon.ax_strength2,
+      awakening_id: collection_weapon.awakening_id,
+      awakening_level: collection_weapon.awakening_level
+    )
+    true
+  end
+
+  ##
+  # Checks if grid weapon is out of sync with collection.
+  #
+  # @return [Boolean] true if any customization differs from collection
+  def out_of_sync?
+    return false unless collection_weapon.present?
+
+    uncap_level != collection_weapon.uncap_level ||
+      transcendence_step != collection_weapon.transcendence_step ||
+      element != collection_weapon.element ||
+      weapon_key1_id != collection_weapon.weapon_key1_id ||
+      weapon_key2_id != collection_weapon.weapon_key2_id ||
+      weapon_key3_id != collection_weapon.weapon_key3_id ||
+      weapon_key4_id != collection_weapon.weapon_key4_id ||
+      ax_modifier1 != collection_weapon.ax_modifier1 ||
+      ax_strength1 != collection_weapon.ax_strength1 ||
+      ax_modifier2 != collection_weapon.ax_modifier2 ||
+      ax_strength2 != collection_weapon.ax_strength2 ||
+      awakening_id != collection_weapon.awakening_id ||
+      awakening_level != collection_weapon.awakening_level
+  end
+
   ##
   # Returns an array of assigned weapon keys.
   #