diff --git a/X2WOTCCommunityHighlander/Src/XComGame/Classes/XComGameState_HeadquartersXCom.uc b/X2WOTCCommunityHighlander/Src/XComGame/Classes/XComGameState_HeadquartersXCom.uc
index 32c7fb58e..cd28a505e 100644
--- a/X2WOTCCommunityHighlander/Src/XComGame/Classes/XComGameState_HeadquartersXCom.uc
+++ b/X2WOTCCommunityHighlander/Src/XComGame/Classes/XComGameState_HeadquartersXCom.uc
@@ -4101,6 +4101,10 @@ function bool HasItemInInventoryOrLoadout(X2ItemTemplate ItemTemplate, optional
 function bool HasUnModifiedItem(XComGameState AddToGameState, X2ItemTemplate ItemTemplate, out XComGameState_Item ItemState, optional bool bLoot = false, optional XComGameState_Item CombatSimTest)
 {
 	local int idx;
+	// Start Issue #1352 - New variables for combat sim stacking behavior
+	local int idxStatBoost;
+	local bool hasIdenticalStatBoosts;
+	// End Issue #1352
 
 	if(bLoot)
 	{
@@ -4137,6 +4141,7 @@ function bool HasUnModifiedItem(XComGameState AddToGameState, X2ItemTemplate Ite
 		for(idx = 0; idx < Inventory.Length; idx++)
 		{
 			ItemState = XComGameState_Item(`XCOMHISTORY.GetGameStateForObjectID(Inventory[idx].ObjectID));
+			hasIdenticalStatBoosts = false;
 
 			if(ItemState == none)
 			{
@@ -4149,10 +4154,27 @@ function bool HasUnModifiedItem(XComGameState AddToGameState, X2ItemTemplate Ite
 				{
 					if(ItemState.GetMyTemplate().ItemCat == 'combatsim')
 					{
-						if(ItemState.StatBoosts.Length > 0 && CombatSimTest.StatBoosts.Length > 0 && ItemState.StatBoosts[0].Boost == CombatSimTest.StatBoosts[0].Boost && ItemState.StatBoosts[0].StatType == CombatSimTest.StatBoosts[0].StatType)
+						/// HL-Docs: ref:Bugfixes; issue:1352
+						/// Mod-added PCS items which did not provide exactly 1 stat boost were not being properly checked by HasUnModifiedItem
+						/// New checks added here mean that PCS items with no stat boosts, or more than one stat boost, are properly compared
+						// Begin Issue #1352
+						hasIdenticalStatBoosts = true;
+						if(CombatSimTest.StatBoosts.Length != 0)
+						{
+							for(idxStatBoost = 0; idxStatBoost < ItemState.StatBoosts.Length; idxStatBoost++)
+							{
+								If(ItemState.StatBoosts[idxStatBoost].Boost != CombatSimTest.StatBoosts[idxStatBoost].Boost || ItemState.StatBoosts[idxStatBoost].StatType != CombatSimTest.StatBoosts[idxStatBoost].StatType)
+								{
+									hasIdenticalStatBoosts = false;
+									break;
+								}
+							}
+						}
+						if(hasIdenticalStatBoosts)
 						{
 							return true;
 						}
+						// End Issue #1352
 					}
 					else
 					{
diff --git a/X2WOTCCommunityHighlander/Src/XComGame/Classes/XComGameState_Item.uc b/X2WOTCCommunityHighlander/Src/XComGame/Classes/XComGameState_Item.uc
index cb5191a7f..d45b44f82 100644
--- a/X2WOTCCommunityHighlander/Src/XComGame/Classes/XComGameState_Item.uc
+++ b/X2WOTCCommunityHighlander/Src/XComGame/Classes/XComGameState_Item.uc
@@ -792,10 +792,14 @@ simulated function bool HasBeenModified()
 		return true;
 	//end issue #104
 		
-	WeaponTemplate = X2WeaponTemplate( m_ItemTemplate );
-
-	// Single line for Issues #93 and #306
-	if ((WeaponTemplate != none) && (GetNumUpgradeSlots() > 0) && (GetMyWeaponUpgradeCount() > 0))
+	WeaponTemplate = X2WeaponTemplate( m_ItemTemplate );	
+	/// HL-Docs: ref:Bugfixes; issue:1429
+	/// When checking weapons for HasBeenModified, checking that the number of upgrade slots > 0 gives an incorrect response
+	/// for weapons which have attachments added by OnAcquired and therefore no slots on the weapon template (e.g. TLE / chosen 
+	/// weapons). Mods which add additional copies of these weapons then cause the items to stack, which interferes with downstream
+	/// logic in GetItemFromInventory and PutItemInInventory, causing attachments to be stripped when the stacked item is equipped.
+	// Single line for Issues #93, #306 and #1429
+	if ((WeaponTemplate != none) /* && (GetNumUpgradeSlots() > 0)*/ && (GetMyWeaponUpgradeCount() > 0))
 		return true;
 
 	return false;