diff --git a/src/Dodge/Update/Scroll.hs b/src/Dodge/Update/Scroll.hs
index 8edae84f5..a9d8f7162 100644
--- a/src/Dodge/Update/Scroll.hs
+++ b/src/Dodge/Update/Scroll.hs
@@ -61,11 +61,14 @@ selectedItemScroll :: Int -> World -> World
 selectedItemScroll scrollamount w = fromMaybe w $ do
     i <- you w ^? crManipulation . manObject . imSelectedItem
     itm <- you w ^? crInv . ix i
-    return $ itemScroll scrollamount itm w
+    return $ itemScroll scrollamount i itm w
 
-itemScroll :: Int -> Item -> World -> World
-itemScroll yi itm w = case itm ^. itType of
+itemScroll :: Int -> Int -> Item -> World -> World
+itemScroll yi invid itm w = case itm ^. itType of
     ATTACH ZOOMSCOPE ->  updateScopeZoom w
+    HELD ALTERIFLE | yi /= 0 -> w
+        & cWorld . lWorld . creatures . ix 0 . crInv . ix invid
+            . itUse . heldAim . aimMuzzles . ix 0 . mzAmmoSlot %~ ((`mod` 2) . (+1))
     _ -> w
 
 -- note that your _crInvLock does not apply to this TODO check that this is what