diff --git a/code/modules/projectiles/guns/projectile/automatic.dm b/code/modules/projectiles/guns/projectile/automatic.dm
index 9cdf5d8f40d..fdbc8004f42 100644
--- a/code/modules/projectiles/guns/projectile/automatic.dm
+++ b/code/modules/projectiles/guns/projectile/automatic.dm
@@ -30,7 +30,7 @@
 
 /obj/item/weapon/gun/projectile/automatic/c20r
 	name = "submachine gun"
-	desc = "The C-20r is a lightweight and rapid firing SMG, for when you REALLY need someone dead. Uses 12mm rounds. Has a 'Scarborough Arms - Per falcis, per pravitas' buttstamp."
+	desc = "The C-20r is a lightweight and rapid firing SMG, for when you REALLY need someone dead. Uses 10mm rounds. Has a 'Scarborough Arms - Per falcis, per pravitas' buttstamp."
 	icon_state = "c20r"
 	item_state = "c20r"
 	w_class = 3