diff --git a/data/lang/equipment-core/en.json b/data/lang/equipment-core/en.json
index e1a37cc069..e581760d44 100644
--- a/data/lang/equipment-core/en.json
+++ b/data/lang/equipment-core/en.json
@@ -523,10 +523,32 @@
     "description": "Equipment name for an OKB-Kaluri Bowfin internal missile launcher",
     "message": "Bowfin Missile Launcher"
   },
+
   "OPLI_INTERNAL_MISSILE_RACK_S2": {
     "description": "Equipment name for an OPLI internal missile rack",
     "message": "OPLI Internal Missile Rack"
   },
+  "OPLI_INTERNAL_MISSILE_RACK_S2_DESCRIPTION": {
+    "description": "Short description and tooltip.",
+    "message": "Internal missile bay for 5x medium missiles."
+  },
+  "OPLI_INTERNAL_MISSILE_RACK_S3": {
+    "description": "Equipment name for an OPLI internal missile rack",
+    "message": "OPLI Internal Missile Rack"
+  },
+  "OPLI_INTERNAL_MISSILE_RACK_S3_DESCRIPTION": {
+    "description": "Short description and tooltip.",
+    "message": "Internal missile bay for 8x medium missiles."
+  },
+  "OPLI_INTERNAL_MISSILE_RACK_S4": {
+    "description": "Equipment name for an OPLI internal missile rack",
+    "message": "OPLI Internal Missile Rack"
+  },
+  "OPLI_INTERNAL_MISSILE_RACK_S4_DESCRIPTION": {
+    "description": "Short description and tooltip.",
+    "message": "Internal missile bay for 12x medium missiles."
+  },
+
   "ORBIT_SCANNER": {
     "description": "A ship equipment that records data of terrain, for cartography mapping/geological survey. Note: Scout Mission module reference and distinguishes between 'orbital' and 'surface' scanner types, the former scans planet from orbit, the latter from low altitude.",
     "message": "Orbital scanner XKM-650"
diff --git a/data/modules/Equipment/Weapons.lua b/data/modules/Equipment/Weapons.lua
index 6b5b14ddc8..a44d0a672f 100644
--- a/data/modules/Equipment/Weapons.lua
+++ b/data/modules/Equipment/Weapons.lua
@@ -397,6 +397,7 @@ Equipment.Register("missile_rack.111", EquipType.New {
 -- Internal Missile Bays
 --===============================================
 
+-- For the Coronatrix, Malabar, Sinonatrix (and Police), and Vatakara
 Equipment.Register("missile_bay.opli_internal_s2", EquipType.New {
 	l10n_key="OPLI_INTERNAL_MISSILE_RACK_S2",
 	price=150, purchasable=true, tech_level=1,
@@ -412,6 +413,48 @@ Equipment.Register("missile_bay.opli_internal_s2", EquipType.New {
 	icon_name="equip_missile_unguided"
 })
 
+-- For the Natrix, and Nerodia
+Equipment.Register("missile_bay.opli_internal_s3", EquipType.New {
+	l10n_key="OPLI_INTERNAL_MISSILE_RACK_S3",
+	price=450, purchasable=true, tech_level=5,
+	volume=8.5, mass=0.9,
+	slot = { type = "missile_bay.opli_internal", size=3, hardpoint=true },
+	provides_slots = {
+		Slot:clone { id = "1", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "2", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "3", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "4", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "5", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "6", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "7", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "8", type = "missile", size = 2, hardpoint = true },
+	},
+	icon_name="equip_missile_unguided"
+})
+
+-- For the Molar Ramsayi
+Equipment.Register("missile_bay.opli_internal_s4", EquipType.New {
+	l10n_key="OPLI_INTERNAL_MISSILE_RACK_S4",
+	price=950, purchasable=true, tech_level=7,
+	volume=11.0, mass=1.1,
+	slot = { type = "missile_bay.opli_internal", size=4, hardpoint=true },
+	provides_slots = {
+		Slot:clone { id = "1", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "2", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "3", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "4", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "5", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "6", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "7", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "8", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "9", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "10", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "11", type = "missile", size = 2, hardpoint = true },
+		Slot:clone { id = "12", type = "missile", size = 2, hardpoint = true },
+	},
+	icon_name="equip_missile_unguided"
+})
+
 Equipment.Register("missile_bay.bowfin_internal", EquipType.New {
 	l10n_key="OKB_KALURI_BOWFIN_MISSILE_RACK",
 	price=150, purchasable=true, tech_level=1,