diff --git a/data/json/items/gun/223.json b/data/json/items/gun/223.json
index d942cdd8fd0de..26a10ce9d8ce7 100644
--- a/data/json/items/gun/223.json
+++ b/data/json/items/gun/223.json
@@ -100,7 +100,7 @@
     "description": "A compact, 7.5 inch barrel version of the classic AR-15 design, commercially marketed as a home defense weapon.",
     "weight": "2267 g",
     "volume": "1758 ml",
-    "longest_side": "1116 mm",
+    "longest_side": "584 mm",
     "price": 91400,
     "price_postapoc": 3500,
     "to_hit": -2,
@@ -143,10 +143,11 @@
     "copy-from": "rifle_auto",
     "looks_like": "ar15",
     "type": "GUN",
-    "name": { "str_sp": "MAS 223" },
+    "name": { "str_sp": "MAS .223" },
     "description": "A bullpup assault rifle that was used by French armed forces only until recently.  While the FAMAS was famous for its high fire rate, the MAS .223 is a semi-auto only variation imported to the US in the late eighties.  It retains the integral bipod, though.",
-    "weight": "3800 g",
-    "volume": "4162 ml",
+    "weight": "3610 g",
+    "volume": "3429 ml",
+    "longest_side": "759 mm",
     "price": 2800000,
     "to_hit": -1,
     "bashing": 12,
@@ -192,6 +193,7 @@
     "description": "A sleek bullpup carbine designed by FN Herstal, complete with an integrated sight accessory rail.  The forward ejecting action and ambidextrous controls make firing comfortable for both left and right-handed shooting.  The whole rifle is well sealed from mud and dust for reliability, but this makes it incompatible with many aftermarket magazines.",
     "weight": "3319 g",
     "volume": "7986 ml",
+    "longest_side": "740 mm",
     "price": 125000,
     "to_hit": -1,
     "bashing": 12,
@@ -233,7 +235,8 @@
     "//": "*Current* milspec gear is now ridiculously overpriced, as seen with the M2010 IRL.",
     "description": "Designed to replace the M4A1, the Heckler and Koch 416A5 features most of the former's strengths, while being considerably more durable.",
     "weight": "3490 g",
-    "volume": "1750 ml",
+    "volume": "4957 ml",
+    "longest_side": "798 mm",
     "price": 540000,
     "price_postapoc": 2250,
     "to_hit": -1,