diff --git a/data/json/items/gun/223.json b/data/json/items/gun/223.json
index b289f6b02586d..62117eeb6dde5 100644
--- a/data/json/items/gun/223.json
+++ b/data/json/items/gun/223.json
@@ -94,6 +94,7 @@
     "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_length": "1116 mm",
     "price": 91400,
     "price_postapoc": 3500,
     "to_hit": -2,
diff --git a/data/json/items/gun/762x25.json b/data/json/items/gun/762x25.json
index df891e2c3e8ae..58988c2ddd2d9 100644
--- a/data/json/items/gun/762x25.json
+++ b/data/json/items/gun/762x25.json
@@ -8,6 +8,7 @@
     "description": "The Soviet-made PPSh-41 is a mass-produced selective-fire submachine gun.  It has a relatively high rate of fire.",
     "weight": "3640 g",
     "volume": "2873 ml",
+    "longest_length": "844 mm",
     "price": 280000,
     "price_postapoc": 2250,
     "to_hit": -2,
@@ -50,6 +51,7 @@
     "description": "The Tokarev TT-33 is an antique Russian semiautomatic pistol, famous for its durability, accuracy, and uncomfortable grip angle.  It was chambered for the 7.62x25mm due to the popularity of the C96 pistol among Russian revolutionaries.",
     "weight": "870 g",
     "volume": "251 ml",
+    "longest_length": "220 mm",
     "price": 100000,
     "price_postapoc": 1250,
     "to_hit": -2,
diff --git a/data/json/items/gun/9x18.json b/data/json/items/gun/9x18.json
index cb032ac54ca70..000ca27139f71 100644
--- a/data/json/items/gun/9x18.json
+++ b/data/json/items/gun/9x18.json
@@ -9,6 +9,7 @@
     "description": "The Pistolet Makarova was developed by the Soviet Union to replace the WWII-era TT-33 pistol.  It uses the 9x18mm cartridge, which remains in use among various former Soviet countries.",
     "weight": "730 g",
     "volume": "346 ml",
+    "longest_length": "196 mm",
     "price": 25000,
     "price_postapoc": 2000,
     "to_hit": -2,