diff --git a/gui/builtinContextMenus/moduleAmmoChange.py b/gui/builtinContextMenus/moduleAmmoChange.py
index d1f8ead3d..33cf5f78f 100644
--- a/gui/builtinContextMenus/moduleAmmoChange.py
+++ b/gui/builtinContextMenus/moduleAmmoChange.py
@@ -6,6 +6,7 @@ import gui.mainFrame
 from eos.const import FittingHardpoint
 from gui.bitmap_loader import BitmapLoader
 from gui.contextMenu import ContextMenu
+from gui.fitCommands.helpers import filterModsByGroups
 from service.fit import Fit
 from service.market import Market
 from service.settings import ContextMenuSettings
@@ -234,31 +235,8 @@ class ChangeModuleAmmo(ContextMenu):
                 modContainer = fit.projectedModules
             else:
                 return
-            sMkt = Market.getInstance()
             selectedModule = self.modules[0]
-            mainGroupID = getattr(sMkt.getGroupByItem(selectedModule.item), 'ID', None)
-            mainMktGroupID = getattr(sMkt.getMarketGroupByItem(selectedModule.item), 'ID', None)
-            positions = []
-            for position, mod in enumerate(modContainer):
-                # Always include selected module itself
-                if mod is selectedModule:
-                    positions.append(position)
-                    continue
-                if mod.itemID is None:
-                    continue
-                # Modules which have the same item ID
-                if mod.itemID == selectedModule.itemID:
-                    positions.append(position)
-                    continue
-                # And modules from the same group and market group too
-                modGroupID = getattr(sMkt.getGroupByItem(mod.item), 'ID', None)
-                modMktGroupID = getattr(sMkt.getMarketGroupByItem(mod.item), 'ID', None)
-                if (
-                    modGroupID is not None and modGroupID == mainGroupID and
-                    modMktGroupID is not None and modMktGroupID == mainMktGroupID
-                ):
-                    positions.append(position)
-                    continue
+            positions = filterModsByGroups(modContainer, selectedModule)
             self.mainFrame.command.Submit(command(
                 fitID=fitID,
                 positions=positions,
diff --git a/gui/fitCommands/helpers.py b/gui/fitCommands/helpers.py
index 0e55f2901..8320f0178 100644
--- a/gui/fitCommands/helpers.py
+++ b/gui/fitCommands/helpers.py
@@ -344,3 +344,31 @@ def restoreCheckedStates(fit, stateInfo, ignoreModPoss=()):
         fit.projectedModules[pos].state = state
     for pos, amountActive in changedProjDrones.items():
         fit.projectedDrones[pos].amountActive = amountActive
+
+
+def filterModsByGroups(mods, mainMod):
+    sMkt = Market.getInstance()
+    mainGroupID = getattr(sMkt.getGroupByItem(mainMod.item), 'ID', None)
+    mainMktGroupID = getattr(sMkt.getMarketGroupByItem(mainMod.item), 'ID', None)
+    positions = []
+    for position, mod in enumerate(mods):
+        # Always include selected module itself
+        if mod is mainMod:
+            positions.append(position)
+            continue
+        if mod.itemID is None:
+            continue
+        # Modules which have the same item ID
+        if mod.itemID == mainMod.itemID:
+            positions.append(position)
+            continue
+        # And modules from the same group and market group too
+        modGroupID = getattr(sMkt.getGroupByItem(mod.item), 'ID', None)
+        modMktGroupID = getattr(sMkt.getMarketGroupByItem(mod.item), 'ID', None)
+        if (
+            modGroupID is not None and modGroupID == mainGroupID and
+            modMktGroupID is not None and modMktGroupID == mainMktGroupID
+        ):
+            positions.append(position)
+            continue
+    return positions