diff --git a/data/json/items/gunmod/mount.json b/data/json/items/gunmod/mount.json
index f01893e6adaed..10fed0eef9ff5 100644
--- a/data/json/items/gunmod/mount.json
+++ b/data/json/items/gunmod/mount.json
@@ -109,7 +109,7 @@
     "symbol": ":",
     "color": "light_gray",
     "location": "stock mount",
-    "mod_targets": [ "smg", "rifle", "pistol", "shotgun", "crossbow", "launcher" ],
+    "mod_targets": [ "smg", "rifle", "pistol", "shotgun", "slingshot", "crossbow", "launcher" ],
     "install_time": "20 m",
     "min_skills": [ [ "gun", 5 ] ],
     "add_mod": [ [ "stock", 1 ] ],
diff --git a/data/json/items/gunmod/stock.json b/data/json/items/gunmod/stock.json
index 509ecabac401b..88d0f8a20a3e0 100644
--- a/data/json/items/gunmod/stock.json
+++ b/data/json/items/gunmod/stock.json
@@ -273,7 +273,7 @@
     "symbol": ":",
     "color": "dark_gray",
     "location": "stock",
-    "mod_targets": [ "smg", "pistol" ],
+    "mod_targets": [ "smg", "pistol", "slingshot" ],
     "install_time": "5 m",
     "dispersion_modifier": -20,
     "handling_modifier": 4,
diff --git a/data/json/items/gunmod/underbarrel.json b/data/json/items/gunmod/underbarrel.json
index 3e655938d2c67..10c016c40af5b 100644
--- a/data/json/items/gunmod/underbarrel.json
+++ b/data/json/items/gunmod/underbarrel.json
@@ -370,7 +370,7 @@
     "sight_dispersion": 30,
     "field_of_view": 3000,
     "aim_speed_modifier": 15,
-    "mod_targets": [ "smg", "rifle", "pistol", "shotgun", "crossbow", "bow", "launcher" ],
+    "mod_targets": [ "smg", "rifle", "pistol", "shotgun", "crossbow", "bow", "slingshot", "launcher" ],
     "min_skills": [ [ "weapon", 2 ], [ "gun", 1 ] ],
     "flags": [ "PUMP_RAIL_COMPATIBLE", "LASER_SIGHT" ]
   },
diff --git a/data/json/items/ranged/slings.json b/data/json/items/ranged/slings.json
index b617950611b5f..8708e473e154f 100644
--- a/data/json/items/ranged/slings.json
+++ b/data/json/items/ranged/slings.json
@@ -49,7 +49,7 @@
     "dispersion": 75,
     "durability": 6,
     "clip_size": 1,
-    "valid_mod_locations": [ [ "grip mount", 1 ], [ "underbarrel mount", 1 ] ],
+    "valid_mod_locations": [ [ "underbarrel mount", 1 ], [ "stock mount", 1 ] ],
     "reload": 50,
     "pocket_data": [ { "pocket_type": "MAGAZINE", "ammo_restriction": { "pebble": 1 } } ]
   },
@@ -117,7 +117,7 @@
     "dispersion": 45,
     "durability": 7,
     "clip_size": 1,
-    "valid_mod_locations": [ [ "grip mount", 1 ], [ "underbarrel mount", 1 ] ],
+    "valid_mod_locations": [ [ "underbarrel mount", 1 ] ],
     "reload": 50,
     "pocket_data": [ { "pocket_type": "MAGAZINE", "ammo_restriction": { "pebble": 1 } } ]
   }