diff --git a/data/json/itemgroups/guns.json b/data/json/itemgroups/guns.json
index 55a9bdee9a010..4953014dc358a 100644
--- a/data/json/itemgroups/guns.json
+++ b/data/json/itemgroups/guns.json
@@ -244,7 +244,6 @@
       { "item": "rm51_assault_rifle", "prob": 25, "charges-min": 0, "charges-max": 50 },
       { "item": "rm614_lmg", "prob": 10, "charges-min": 0, "charges-max": 100 },
       { "item": "rm88_battle_rifle", "prob": 25, "charges-min": 0, "charges-max": 50 },
-      { "item": "sig552", "prob": 100, "charges-min": 0, "charges-max": 30 },
       { "item": "scar_l", "prob": 50, "charges-min": 0, "charges-max": 30 },
       { "item": "scar_h", "prob": 50, "charges-min": 0, "charges-max": 20 },
       { "item": "m110a1", "prob": 50, "charges-min": 0, "charges-max": 20 },
@@ -278,7 +277,9 @@
       { "item": "trex_gun", "prob": 60 },
       { "item": "arx160", "prob": 40, "charges-min": 0, "charges-max": 30 },
       { "item": "iwi_tavor_x95_300blk", "prob": 10, "charges-min": 0, "charges-max": 30 },
-      { "item": "acr_300blk", "prob": 15, "charges-min": 0, "charges-max": 30 }
+      { "item": "acr_300blk", "prob": 15, "charges-min": 0, "charges-max": 30 },
+      { "item": "sig553", "prob": 5, "charges-min": 0, "charges-max": 30 },
+      { "item": "sig550", "prob": 3, "charges-min": 0, "charges-max": 30 }
     ]
   },
   {
diff --git a/data/json/itemgroups/magazines.json b/data/json/itemgroups/magazines.json
index 1d753bfaefb78..30abfd1870404 100644
--- a/data/json/itemgroups/magazines.json
+++ b/data/json/itemgroups/magazines.json
@@ -252,7 +252,9 @@
       [ "m1918bigmag", 40 ],
       [ "ruger1022bigmag", 70 ],
       [ "lw223mag", 20 ],
-      [ "lw223bigmag", 20 ]
+      [ "lw223bigmag", 20 ],
+      [ "sig_sg20", 3 ],
+      [ "sig_sg30", 5 ]
     ]
   },
   {
diff --git a/data/json/items/gun/223.json b/data/json/items/gun/223.json
index e7a56e160400c..27a453a5c35ee 100644
--- a/data/json/items/gun/223.json
+++ b/data/json/items/gun/223.json
@@ -424,25 +424,76 @@
     "magazines": [ [ "223", [ "stanag30", "stanag50", "survivor223mag" ] ] ]
   },
   {
-    "id": "sig552",
+    "id": "sig550",
     "copy-from": "rifle_auto",
     "looks_like": "ar15",
     "type": "GUN",
-    "name": { "str": "SIG 552" },
+    "name": { "str": "SIG SG 550" },
+    "description": "SIG SG 550 is an assault rifle made to be operated under the coldest, harshest conditions in the mountains of Switzerland.  Accurate and reliable, like a Swiss watch.",
+    "weight": "3600 g",
+    "volume": "2795 ml",
+    "price": 400000,
+    "to_hit": -1,
+    "bashing": 12,
+    "material": [ "steel", "plastic" ],
+    "ammo": "223",
+    "dispersion": 140,
+    "durability": 9,
+    "min_cycle_recoil": 1350,
+    "modes": [ [ "DEFAULT", "semi-auto", 1 ], [ "BURST", "3 rd.", 3 ], [ "AUTO", "auto", 4 ] ],
+    "default_mods": [ "bipod" ],
+    "built_in_mods": [ "folding_stock" ],
+    "valid_mod_locations": [
+      [ "accessories", 4 ],
+      [ "barrel", 1 ],
+      [ "bore", 1 ],
+      [ "brass catcher", 1 ],
+      [ "mechanism", 4 ],
+      [ "muzzle", 1 ],
+      [ "sights", 1 ],
+      [ "sling", 1 ],
+      [ "grip", 1 ],
+      [ "rail mount", 1 ],
+      [ "stock", 1 ],
+      [ "underbarrel", 1 ]
+    ],
+    "magazines": [ [ "223", [ "sig_sg30", "sig_sg20" ] ] ]
+  },
+  {
+    "id": "sig553",
+    "copy-from": "rifle_auto",
+    "looks_like": "ar15",
+    "type": "GUN",
+    "name": { "str": "SIG SG 553" },
     "description": "A compact selective fire automatic rifle designed for the Swiss military.  It features a three-round burst mode and an integrated folding stock.",
     "weight": "3000 g",
-    "volume": "1750 ml",
+    "volume": "2150 ml",
     "price": 320000,
     "to_hit": -1,
     "bashing": 10,
     "material": [ "steel", "plastic" ],
     "ammo": "223",
+    "ranged_damage": -6,
     "dispersion": 180,
     "durability": 9,
     "min_cycle_recoil": 1350,
     "modes": [ [ "DEFAULT", "semi-auto", 1 ], [ "BURST", "3 rd.", 3 ], [ "AUTO", "auto", 4 ] ],
     "built_in_mods": [ "folding_stock" ],
-    "magazines": [ [ "223", [ "stanag30", "stanag50", "survivor223mag" ] ] ]
+    "valid_mod_locations": [
+      [ "accessories", 4 ],
+      [ "barrel", 1 ],
+      [ "bore", 1 ],
+      [ "brass catcher", 1 ],
+      [ "mechanism", 4 ],
+      [ "muzzle", 1 ],
+      [ "sights", 1 ],
+      [ "sling", 1 ],
+      [ "grip", 1 ],
+      [ "rail mount", 1 ],
+      [ "stock", 1 ],
+      [ "underbarrel mount", 1 ]
+    ],
+    "magazines": [ [ "223", [ "sig_sg30", "sig_sg20" ] ] ]
   },
   {
     "id": "steyr_aug",
diff --git a/data/json/items/magazine/223.json b/data/json/items/magazine/223.json
index 47d69c343d536..201bc29919049 100644
--- a/data/json/items/magazine/223.json
+++ b/data/json/items/magazine/223.json
@@ -115,6 +115,38 @@
     "reliability": 8,
     "flags": [ "MAG_COMPACT" ]
   },
+  {
+    "id": "sig_sg20",
+    "type": "MAGAZINE",
+    "name": "SIG SG 20-round magazine",
+    "description": "A slick 20-round capacity magazine used with SIG SG rifles.",
+    "weight": "90 g",
+    "volume": "400 ml",
+    "price": 15000,
+    "material": "plastic",
+    "symbol": "#",
+    "color": "light_gray",
+    "ammo_type": "223",
+    "capacity": 20,
+    "reliability": 8,
+    "flags": [ "MAG_COMPACT" ]
+  },
+  {
+    "id": "sig_sg30",
+    "type": "MAGAZINE",
+    "name": "SIG SG 30-round magazine",
+    "description": "A standard capacity magazine used with SIG SG rifles.",
+    "weight": "110 g",
+    "volume": "500 ml",
+    "price": 17500,
+    "material": "plastic",
+    "symbol": "#",
+    "color": "light_gray",
+    "ammo_type": "223",
+    "capacity": 30,
+    "reliability": 8,
+    "flags": [ "MAG_COMPACT" ]
+  },
   {
     "id": "stanag30",
     "type": "MAGAZINE",
diff --git a/data/json/items/migration.json b/data/json/items/migration.json
index 7d070924b2dd9..d94e7490de3b2 100644
--- a/data/json/items/migration.json
+++ b/data/json/items/migration.json
@@ -988,5 +988,10 @@
     "id": "40mm_casing",
     "type": "MIGRATION",
     "replace": "40x46mm_m118_casing"
+  },
+  {
+    "id": "sig552",
+    "type": "MIGRATION",
+    "replace": "sig553"
   }
 ]
diff --git a/data/json/martialarts.json b/data/json/martialarts.json
index 92bf6897be7b9..e7180ec3d15f4 100644
--- a/data/json/martialarts.json
+++ b/data/json/martialarts.json
@@ -634,7 +634,7 @@
       "m27iar",
       "rm51_assault_rifle",
       "rm88_battle_rifle",
-      "sig552",
+      "sig553",
       "sks",
       "steyr_aug"
     ]
diff --git a/data/json/recipes/weapon/magazines.json b/data/json/recipes/weapon/magazines.json
index 5ea6c15d9f4b1..8a9e3f31a21c2 100644
--- a/data/json/recipes/weapon/magazines.json
+++ b/data/json/recipes/weapon/magazines.json
@@ -126,7 +126,6 @@
         [ "m4a1", -1 ],
         [ "m16a4", -1 ],
         [ "scar_l", -1 ],
-        [ "sig552", -1 ],
         [ "surv_carbine_223", -1 ]
       ],
       [ [ "small_repairkit", 10 ], [ "large_repairkit", 5 ] ]
diff --git a/data/mods/Generic_Guns/firearms/gg_firearms_migration.json b/data/mods/Generic_Guns/firearms/gg_firearms_migration.json
index 8e2d504853afe..9a05919b792a8 100644
--- a/data/mods/Generic_Guns/firearms/gg_firearms_migration.json
+++ b/data/mods/Generic_Guns/firearms/gg_firearms_migration.json
@@ -275,7 +275,8 @@
       "mosin91_30",
       "ar15",
       "ruger_mini",
-      "sig552",
+      "sig553",
+      "sig550",
       "steyr_aug",
       "iwi_tavor_x95_300blk",
       "ar15_retool_300blk",
diff --git a/data/mods/Generic_Guns/magazines/gg_magazines_migration.json b/data/mods/Generic_Guns/magazines/gg_magazines_migration.json
index 0625cba48c116..0523ffb2f7b9a 100644
--- a/data/mods/Generic_Guns/magazines/gg_magazines_migration.json
+++ b/data/mods/Generic_Guns/magazines/gg_magazines_migration.json
@@ -156,6 +156,8 @@
       "lw223mag",
       "stanag30",
       "stanag50",
+      "sig_sg20",
+      "sig_sg30",
       "blrmag",
       "m1918bigmag",
       "m1918mag",