simplified

code/__DEFINES/mobs.dm

@@ -418,6 +418,3 @@ var/list/default_xeno_onmob_icons = list(
 #define EXTREMITY_LIMBS list("l_leg","l_foot","r_leg","r_foot","l_arm","l_hand","r_arm","r_hand")
 #define CORE_LIMBS list("chest","head","groin")
 
-
-/// Overall percentage miss chance if you were to target a random body part, averaged from entries in global list base_miss_chance
-#define MOB_OVERALL_MISS_CHANCE 15

code/modules/mob/mob_helpers.dm

@@ -28,7 +28,7 @@
 
 //TODO: Integrate defence zones and targeting body parts with the actual organ system, move these into organ definitions.
 
-/// The base miss chance for the different defence zones (see also MOB_OVERALL_MISS_CHANCE)
+/// The base miss chance for the different defence zones
 var/list/global/base_miss_chance = list(
 	"head" = 10,
 	"chest" = 0,

code/modules/projectiles/projectile.dm

@@ -476,12 +476,10 @@
 		// At present, Xenos have no inherent effects or localized damage stemming from limb targeting
 		// Therefore we exempt the shooter from direct hit accuracy penalties as well,
 		// simply to avoid them from resetting target to chest every time they want to shoot a xeno
-		if(isxeno(L))
-			if(!direct_hit)
-				hit_chance -= MOB_OVERALL_MISS_CHANCE // Averaged miss chance across all limbs
-			// else treat this as a chest shot (0 penalty) regardless of aim for the pupose of hit rolls
-		else // For all other normal people we just apply per-limb hit penalty
+
+		if(!direct_hit || !isxeno(L)) // For normal people or direct hits we apply the limb accuracy penalty
 			hit_chance -= base_miss_chance[def_zone]
+		// else for direct hits on xenos, we skip it, pretending it's a chest shot with zero penalty
 
 		#if DEBUG_HIT_CHANCE
 		to_world(SPAN_DEBUG("([L]) Hit chance: [hit_chance] | Roll: [hit_roll]"))