diff --git a/code/modules/halo/weapons/covenant/ammo.dm b/code/modules/halo/weapons/covenant/ammo.dm
index 596c299d7d3d3..134a4dc805cd2 100644
--- a/code/modules/halo/weapons/covenant/ammo.dm
+++ b/code/modules/halo/weapons/covenant/ammo.dm
@@ -359,7 +359,7 @@
 /obj/item/projectile/bullet/covenant/concussion_rifle
 	name = "heavy plasma round"
 	damage = 50
-	armor_penetration = 40
+	armor_penetration = 50
 	shield_damage = 50
 	step_delay = 0.75 //slower than most
 	icon = 'code/modules/halo/weapons/icons/Covenant_Projectiles.dmi'