diff --git a/src/combat_ai.cc b/src/combat_ai.cc
index da67e41..9a42bd8 100644
--- a/src/combat_ai.cc
+++ b/src/combat_ai.cc
@@ -1714,17 +1714,18 @@ static Object* _ai_best_weapon(Object* attacker, Object* weapon1, Object* weapon
             return NULL;
         }
 
-        avgDamage1 = (maxDamage - minDamage) / 2;
+        // SFALL: Fix avg damage calculation.
+        avgDamage1 = (maxDamage + minDamage) / 2;
         if (_item_w_area_damage_radius(weapon1, HIT_MODE_RIGHT_WEAPON_PRIMARY) > 0 && defender != NULL) {
             attack.weapon = weapon1;
             _compute_explosion_on_extras(&attack, 0, weaponIsGrenade(weapon1), 1);
             avgDamage1 *= attack.extrasLength + 1;
         }
 
-        // TODO: Probably an error, why it takes [weapon2], should likely use
-        // [weapon1].
-        if (weaponGetPerk(weapon2) != -1) {
-            avgDamage1 *= 5;
+        // SFALL: Fix for the incorrect item being checked.
+        if (weaponGetPerk(weapon1) != -1) {
+            // SFALL: Lower weapon score multiplier for having perk.
+            avgDamage1 *= 2;
         }
 
         if (defender != NULL) {
@@ -1758,7 +1759,8 @@ static Object* _ai_best_weapon(Object* attacker, Object* weapon1, Object* weapon
             return NULL;
         }
 
-        avgDamage2 = (maxDamage - minDamage) / 2;
+        // SFALL: Fix avg damage calculation.
+        avgDamage2 = (maxDamage + minDamage) / 2;
         if (_item_w_area_damage_radius(weapon2, HIT_MODE_RIGHT_WEAPON_PRIMARY) > 0 && defender != NULL) {
             attack.weapon = weapon2;
             _compute_explosion_on_extras(&attack, 0, weaponIsGrenade(weapon2), 1);
@@ -1766,7 +1768,8 @@ static Object* _ai_best_weapon(Object* attacker, Object* weapon1, Object* weapon
         }
 
         if (weaponGetPerk(weapon2) != -1) {
-            avgDamage2 *= 5;
+            // SFALL: Lower weapon score multiplier for having perk.
+            avgDamage2 *= 2;
         }
 
         if (defender != NULL) {