diff --git a/data/json/items/gun/223.json b/data/json/items/gun/223.json
index 9abd349707c84..1e828d325cb50 100644
--- a/data/json/items/gun/223.json
+++ b/data/json/items/gun/223.json
@@ -6,8 +6,9 @@
     "type": "GUN",
     "name": { "str": "Remington ACR" },
     "description": "This carbine was developed for military use in the early 21st century.  It is damaging and accurate, though its rate of fire is a bit slower than competing .223 carbines.",
-    "weight": "3590 g",
-    "volume": "2 L",
+    "weight": "3719 g",
+    "volume": "3310 ml",
+    "longest_side": "938 mm",
     "price": 234300,
     "price_postapoc": 6000,
     "to_hit": -1,
@@ -54,8 +55,9 @@
     "name": { "str": "AR-15" },
     "//": "This is assumed to be the standard model matching the (currently not in-game) M16. Tileset whitelist for rifles",
     "description": "This ubiquitous rifle is the forefather of M16 rifle series.  It is lightweight and accurate, but will malfunction if not properly maintained.  This one is a semi-automatic civilian version.",
-    "weight": "3500 g",
-    "volume": "2 L",
+    "weight": "3170 g",
+    "volume": "3100 ml",
+    "longest_side": "930 mm",
     "price": 125000,
     "price_postapoc": 4000,
     "to_hit": -1,
@@ -297,7 +299,8 @@
     "name": { "str": "H&K G36" },
     "description": "Designed as a replacement for the early H&K G3 battle rifle, the G36 is more accurate, and uses the much-lighter .223 round, allowing for a higher ammo capacity.",
     "weight": "3630 g",
-    "volume": "2500 ml",
+    "volume": "4640 ml",
+    "longest_side": "1004 mm",
     "price": 210000,
     "price_postapoc": 6000,
     "to_hit": -1,
@@ -327,8 +330,9 @@
     "type": "GUN",
     "name": { "str": "M249" },
     "description": "The M249 is a mountable machine gun used by the US military and SWAT teams.  Quite inaccurate and difficult to control, the M249 is designed to fire many rounds very quickly.",
-    "weight": "7330 g",
-    "volume": "3 L",
+    "weight": "7500 g",
+    "volume": "10610 ml",
+    "longest_side": "1035 mm",
     "price": 750000,
     "price_postapoc": 8000,
     "to_hit": -1,
@@ -429,8 +433,9 @@
     "type": "GUN",
     "name": { "str": "M4A1" },
     "description": "A popular carbine, long used by the US military.  Though accurate, small, and lightweight, it is infamous for its unreliability when not properly maintained.",
-    "weight": "3160 g",
-    "volume": "1750 ml",
+    "weight": "2880 g",
+    "volume": "3310 ml",
+    "longest_side": "758 mm",
     "price": 240000,
     "price_postapoc": 5000,
     "to_hit": -1,
@@ -475,8 +480,9 @@
     "type": "GUN",
     "name": { "str": "M16A4" },
     "description": "The M16 is a very common assault rifle descended from the AR-15, used by militaries across the world for over 50 years.  It is a gas operated, rotating bolt rifle known for its accuracy and controllable recoil.",
-    "weight": "3510 g",
-    "volume": "1750 ml",
+    "weight": "3260 g",
+    "volume": "5030 ml",
+    "longest_side": "1003 mm",
     "price": 240000,
     "price_postapoc": 5000,
     "to_hit": -1,
@@ -583,7 +589,8 @@
     "name": { "str": "Ruger Mini-14" },
     "description": "A small, lightweight semi-auto carbine designed for civilian and police use.  Its superb accuracy and low recoil makes it more suitable than full-auto rifles for some situations.",
     "weight": "3180 g",
-    "volume": "2 L",
+    "volume": "2900 ml",
+    "longest_side": "977 mm",
     "price": 92100,
     "price_postapoc": 3750,
     "to_hit": -1,
@@ -628,8 +635,9 @@
     "type": "GUN",
     "name": { "str": "FN SCAR-L" },
     "description": "A highly accurate and modular assault rifle specially designed for the United States Special Operations Command.  The 'L' in its name stands for light, as it uses the lightweight .223 round.",
-    "weight": "3300 g",
-    "volume": "2250 ml",
+    "weight": "3500 g",
+    "volume": "4970 ml",
+    "longest_side": "850 mm",
     "price": 280000,
     "price_postapoc": 6000,
     "to_hit": -1,
@@ -674,8 +682,9 @@
     "type": "GUN",
     "name": { "str": "SIG 552" },
     "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",
+    "weight": "3200 g",
+    "volume": "2950 ml",
+    "longest_side": "741 mm",
     "price": 320000,
     "price_postapoc": 6000,
     "to_hit": -1,
@@ -719,7 +728,8 @@
     "name": { "str": "Steyr AUG" },
     "description": "The Steyr AUG is an Austrian assault rifle that uses a bullpup design.  It is used in the armed forces and police forces of many nations, and enjoys low recoil and high accuracy.",
     "weight": "3500 g",
-    "volume": "1500 ml",
+    "volume": "3520 ml",
+    "longest_side": "715 mm",
     "price": 490000,
     "price_postapoc": 6000,
     "to_hit": -1,