diff --git a/restoration/source410/BT/MECHWEAP.NOTES.md b/restoration/source410/BT/MECHWEAP.NOTES.md
index a87fd18a..cf6b3018 100644
--- a/restoration/source410/BT/MECHWEAP.NOTES.md
+++ b/restoration/source410/BT/MECHWEAP.NOTES.md
@@ -150,3 +150,13 @@ cycling — the NoAmmo roach-motel holds.  Zero Fail.
   Energy), ER-M 3.43 (type 3 Laser), SRM6 5.83×6 (type 2 Explosive); repeat
   hits climb linearly; zones reach 1.0 Burning/Destroyed; no-target runs hold
   fire (0 FIRED across a 65s force-fire run without a target).
+
+## 5.3.18a — salvo economy CORRECTED (BT411 task #62)
+
+The 5.3.16 "one message per missile" loop was ~missileCount-times too lethal.
+The arcade fires ONE cluster Missile per trigger and its zone damage lands
+EXACTLY ONCE: damageData carries the ctor's salvo-split per-missile amount
+with burstCount=missileCount (burstCount feeds only gyro bounce + splash
+falloff — never the zone formula). MISLANCH now dispatches a single
+SendDamage per salvo (verified 1:1 FIRED:[dmg]). The cluster SPLASH component
+arrives with the Missile entity wave (proximity-fuse detonation).
diff --git a/restoration/source410/BT/MISLANCH.CPP b/restoration/source410/BT/MISLANCH.CPP
index 2fb459b2..dbb89ecf 100644
--- a/restoration/source410/BT/MISLANCH.CPP
+++ b/restoration/source410/BT/MISLANCH.CPP
@@ -113,22 +113,20 @@ void
 	}
 
 	//
-	// The salvo delivery: ONE TakeDamageMessage per missile, each carrying
-	// the salvo-split per-missile damage (the ctor split the authored amount
-	// across missileCount).  The zone armor formula IGNORES burstCount
-	// (BT411 combat-damage: one message = one amount*scale application), so
-	// a single split message would under-deliver the salvo by the round
-	// count.  INTERIM instant-hit with every round hitting (its own random
-	// zone) -- the Missile entity flight / seeker / proximity fuse joins the
-	// entity-spawn wave.
+	// The salvo delivery (CORRECTED to the arcade economy, BT411 task #62):
+	// the binary fires ONE cluster Missile per trigger and its zone damage
+	// lands EXACTLY ONCE -- damageData carries the ctor's salvo-split
+	// per-missile amount with burstCount = missileCount, and the zone armor
+	// formula ignores burstCount (it feeds only the gyro bounce + the splash
+	// falloff).  A per-round delivery loop was ~missileCount-times too
+	// lethal (the port's "2-shot kill" regression).  INTERIM instant-hit --
+	// the Missile entity flight / seeker / proximity fuse / cluster SPLASH
+	// is the missile wave.
 	//
 	if (targetWithinRange && owner != NULL
 		&& owner->GetTargetEntity() != NULL)
 	{
-		for (int mm = 0; mm < missileCount; ++mm)
-		{
-			SendDamage(owner->GetTargetEntity(), damageData);
-		}
+		SendDamage(owner->GetTargetEntity(), damageData);
 	}
 
 	if (getenv("BT_MECH_LOG"))