diff --git a/game/reconstructed/mech4.cpp b/game/reconstructed/mech4.cpp
index ee88af5..64646ab 100644
--- a/game/reconstructed/mech4.cpp
+++ b/game/reconstructed/mech4.cpp
@@ -597,7 +597,9 @@ static const Scalar kBlockHysteresis = 0.4f;
 // E8 weapon trigger (bring-up): pulsed per player frame; read by EmitterSimulation
 // (emitter.cpp) so the real weapon's CheckFireEdge sees rising edges.  Non-static
 // (the emitter externs it).
-int                 gBTWeaponTrigger = 0;
+int                 gBTWeaponTrigger  = 0;
+int                 gBTMissileTrigger = 0;	// the split missile-fire channel (CTRL)
+static int          gBTMissileKey     = 0;	// raw key state (set by the keyboard poll)
 
 // Damage: each shot dispatches a REAL Entity::TakeDamageMessage to the target.  Now
 // that the damage zones are constructed (mech.cpp Pass-3 zone build), the engine base
@@ -1196,7 +1198,11 @@ void
 					gBTDrive.keyBack  = focused && ((pAsync('S') | pAsync(0x28 /*VK_DOWN*/))  & dn) ? 1 : 0;
 					gBTDrive.keyLeft  = focused && ((pAsync('A') | pAsync(0x25 /*VK_LEFT*/))  & dn) ? 1 : 0;
 					gBTDrive.keyRight = focused && ((pAsync('D') | pAsync(0x27 /*VK_RIGHT*/)) & dn) ? 1 : 0;
-					gBTDrive.fire     = focused && ((pAsync(0x20 /*VK_SPACE*/) | pAsync(0x11 /*VK_CONTROL*/)) & dn) ? 1 : 0;
+					// SPLIT WEAPON CONTROLS (interim, toward the real controls-mapper
+					// weapon groups): SPACE = the energy weapons (lasers), CTRL = the
+					// missile launchers.  (Both used to share one fire-everything key.)
+					gBTDrive.fire     = focused && (pAsync(0x20 /*VK_SPACE*/) & dn) ? 1 : 0;
+					gBTMissileKey     = focused && (pAsync(0x11 /*VK_CONTROL*/) & dn) ? 1 : 0;
 					static int sPrevX = 0;
 					const int xNow = focused && (pAsync('X') & dn) ? 1 : 0;
 					if (xNow && !sPrevX) gBTDrive.allStop = 1;	// edge -> one all-stop
@@ -2323,6 +2329,10 @@ void
 				// the real Emitter only fires at a target in the forward arc -- no
 				// heat/damage out of arc (you can't shoot the enemy behind you).
 				gBTWeaponTrigger = (fireWanted && targetInArc) ? (gBTWeaponTrigger ? 0 : 1) : 0;
+				// the missile channel: CTRL (or the autofire harness) -- same edge pulse
+				extern int gBTMissileTrigger;
+				const int missileWanted = gBTDrive.fireForced || gBTMissileKey;
+				gBTMissileTrigger = (missileWanted && targetInArc) ? (gBTMissileTrigger ? 0 : 1) : 0;
 
 			// Resolve the "explode" effect resource once.
 			if (gExplodeReady == 0)
@@ -2616,6 +2626,22 @@ void
 		DEBUG_STREAM << "[tick] first frame: dispatched to " << subsystemsTicked
 			<< " executable subsystem(s) of " << subsystemsPresent
 			<< " present / roster " << subsystemCount << "\n" << std::flush;
+		// DEV: BT_ROSTER=1 dumps the LOADOUT -- every roster subsystem's class
+		// name + id (settles "is this mech supposed to mount weapon X?" from the
+		// shipped subsystem stream, not assumptions).
+		if (getenv("BT_ROSTER"))
+		{
+			for (int ri = 0; ri < subsystemCount; ++ri)
+			{
+				Subsystem *rs = GetSubsystem(ri);
+				if (rs == 0)
+					continue;
+				Derivation *rd = rs->GetDerivation();
+				DEBUG_STREAM << "[roster] " << ri
+					<< " classID=" << (int)rs->GetClassID()
+					<< " " << (rd ? rd->className : "?") << "\n" << std::flush;
+			}
+		}
 	}
 
 	// 1 Hz confirmation that the tick path is live (N subsystems simulated).
diff --git a/game/reconstructed/projweap.cpp b/game/reconstructed/projweap.cpp
index 401ee5d..e997cf2 100644
--- a/game/reconstructed/projweap.cpp
+++ b/game/reconstructed/projweap.cpp
@@ -534,16 +534,19 @@ void
 
 	// 2. Rising-edge trigger from the owning Mech's discharge signal.
 	//    Bring-up: the controls mapper is bypassed, so drive fireImpulse from the
-	//    per-frame gBTWeaponTrigger (same as EmitterSimulation) -- else CheckFireEdge
-	//    never sees an edge and a projectile weapon never fires.
-	extern int gBTWeaponTrigger;
-	fireImpulse = (Scalar)gBTWeaponTrigger;				// this+0x31C
+	//    per-frame trigger pulse -- else CheckFireEdge never sees an edge and a
+	//    projectile weapon never fires.  SPLIT CONTROLS (interim, toward the real
+	//    controls-mapper weapon groups): projectile weapons (the missile
+	//    launchers, cannon) fire on the MISSILE channel (CTRL), not the
+	//    energy-weapon channel (SPACE) -- one key no longer fires everything.
+	extern int gBTMissileTrigger;
+	fireImpulse = (Scalar)gBTMissileTrigger;			// this+0x31C
 	Logical trigger = CheckFireEdge();					// MechWeapon @004b9608
 
 	static int s_pwtick = 0;
 	if (getenv("BT_PROJ_LOG") && (((++s_pwtick) % 240) == 0 || trigger))
 		DEBUG_STREAM << "[projweap] tick " << GetName() << " trig=" << (int)trigger
-			<< " gTrig=" << gBTWeaponTrigger << " ready=" << (int)ReadyToFire()
+			<< " gTrig=" << gBTMissileTrigger << " ready=" << (int)ReadyToFire()
 			<< " state=" << weaponAlarm.GetState() << " recoil=" << recoil << " x\n" << std::flush;
 
 	// 3. Firing state machine (weaponAlarm @0x350).  Modelled on the RP analog