diff --git a/include/Kyoto/Audio/CSfxManager.hpp b/include/Kyoto/Audio/CSfxManager.hpp
index b7ed946a..74a46d20 100644
--- a/include/Kyoto/Audio/CSfxManager.hpp
+++ b/include/Kyoto/Audio/CSfxManager.hpp
@@ -29,6 +29,7 @@ public:
   static void PitchBend(CSfxHandle handle, int pitch);
 
   static CSfxHandle SfxStart(u16 id, u8 vol, u8 pan, bool useAcoustics, s16 prio, bool looped, s32 areaId);
+  static bool IsPlaying(const CSfxHandle& handle);
 };
 
 #endif
diff --git a/include/MetroidPrime/CStateManager.hpp b/include/MetroidPrime/CStateManager.hpp
index d73213ed..64007186 100644
--- a/include/MetroidPrime/CStateManager.hpp
+++ b/include/MetroidPrime/CStateManager.hpp
@@ -15,6 +15,7 @@
 #include "MetroidPrime/Cameras/CCameraBlurPass.hpp"
 #include "MetroidPrime/Cameras/CCameraFilterPass.hpp"
 #include "MetroidPrime/TGameTypes.hpp"
+#include "MetroidPrime/Weapons/WeaponTypes.hpp"
 
 #include "rstl/auto_ptr.hpp"
 #include "rstl/list.hpp"
@@ -123,6 +124,8 @@ public:
   TAreaId GetNextAreaId() const { return x8cc_nextAreaId; }
   void SetCurrentAreaId(TAreaId);
 
+  bool CanCreateProjectile(TUniqueId, EWeaponType, int) const;
+
   CMazeState* CurrentMaze();
   const CMazeState* GetCurrentMaze() const;
   void SetCurrentMaze(rstl::single_ptr< CMazeState > maze);
diff --git a/include/MetroidPrime/Player/CPlayer.hpp b/include/MetroidPrime/Player/CPlayer.hpp
index 2eec3b5a..a3cdc0ed 100644
--- a/include/MetroidPrime/Player/CPlayer.hpp
+++ b/include/MetroidPrime/Player/CPlayer.hpp
@@ -171,6 +171,8 @@ public:
   TUniqueId GetOrbitTargetId() const { return x310_orbitTargetId; }
   TUniqueId GetOrbitNextTargetId() const { return x33c_orbitNextTargetId; }
   TUniqueId GetScanningObjectId() const { return x3b4_scanningObject; }
+  EGrappleState GetGrappleState() const { return x3b8_grappleState; }
+  EGunHolsterState GetGunHolsterState() const { return x498_gunHolsterState; }
 
 private:
   struct CVisorSteam {
diff --git a/include/MetroidPrime/Player/CPlayerGun.hpp b/include/MetroidPrime/Player/CPlayerGun.hpp
index 63f9b0ac..68104e8f 100644
--- a/include/MetroidPrime/Player/CPlayerGun.hpp
+++ b/include/MetroidPrime/Player/CPlayerGun.hpp
@@ -60,10 +60,10 @@ public:
     kBW_PowerBomb,
   };
   enum EPhazonBeamState {
-    kKBS_Inactive,
-    kKBS_Entering,
-    kKBS_Exiting,
-    kKBS_Active,
+    kPBS_Inactive,
+    kPBS_Entering,
+    kPBS_Exiting,
+    kPBS_Active,
   };
   enum EChargePhase {
     kCP_NotCharging,
diff --git a/include/MetroidPrime/Weapons/CAuxWeapon.hpp b/include/MetroidPrime/Weapons/CAuxWeapon.hpp
index 69d5f177..5b447945 100644
--- a/include/MetroidPrime/Weapons/CAuxWeapon.hpp
+++ b/include/MetroidPrime/Weapons/CAuxWeapon.hpp
@@ -7,6 +7,8 @@ class CAuxWeapon {
 public:
   explicit CAuxWeapon(TUniqueId playerId);
 
+  bool IsComboFxActive(const CStateManager& mgr) const;
+
 private:
   u8 x0_pad[0x84];
 };
diff --git a/include/MetroidPrime/Weapons/CGunWeapon.hpp b/include/MetroidPrime/Weapons/CGunWeapon.hpp
index e35622c6..605b0bc8 100644
--- a/include/MetroidPrime/Weapons/CGunWeapon.hpp
+++ b/include/MetroidPrime/Weapons/CGunWeapon.hpp
@@ -83,6 +83,7 @@ public:
 
   CAABox GetBounds() const;
   CAABox GetBounds(const CTransform4f& xf) const;
+  const SWeaponInfo& GetWeaponInfo() const;
 
 private:
   // x0 is vtable
diff --git a/include/MetroidPrime/Weapons/CPowerBomb.hpp b/include/MetroidPrime/Weapons/CPowerBomb.hpp
new file mode 100644
index 00000000..473dbe2e
--- /dev/null
+++ b/include/MetroidPrime/Weapons/CPowerBomb.hpp
@@ -0,0 +1,21 @@
+#ifndef _CPOWERBOMB_HPP_
+#define _CPOWERBOMB_HPP_
+
+#include "MetroidPrime/Weapons/CWeapon.hpp"
+
+class CElementGen;
+
+class CPowerBomb : public CWeapon {
+  bool x158_24_canStartFilter : 1;
+  bool x158_25_filterEnabled : 1;
+  float x15c_curTime;
+  float x160_curRadius;
+  float x164_radiusIncrement;
+  rstl::single_ptr<CElementGen> x168_particle;
+  float x16c_radius;
+
+public:
+  float GetCurTime() const { return x15c_curTime; }
+};
+
+#endif // _CPOWERBOMB_HPP_
diff --git a/include/MetroidPrime/Weapons/WeaponCommon.hpp b/include/MetroidPrime/Weapons/WeaponCommon.hpp
index bf9e0bb8..8a7ddb06 100644
--- a/include/MetroidPrime/Weapons/WeaponCommon.hpp
+++ b/include/MetroidPrime/Weapons/WeaponCommon.hpp
@@ -17,6 +17,8 @@ enum EGunAnimType {
   kGAT_ToBeam
 };
 
+CSfxHandle play_sfx(u16 sfx, bool underwater, bool looped, short pan);
+
 }
 
 #endif _WEAPONCOMMON_HPP
diff --git a/src/MetroidPrime/Player/CPlayerGun.cpp b/src/MetroidPrime/Player/CPlayerGun.cpp
index da0ce81d..1d0555e3 100644
--- a/src/MetroidPrime/Player/CPlayerGun.cpp
+++ b/src/MetroidPrime/Player/CPlayerGun.cpp
@@ -15,6 +15,7 @@
 #include "MetroidPrime/Weapons/CPhazonBeam.hpp"
 #include "MetroidPrime/Weapons/CPlasmaBeam.hpp"
 #include "MetroidPrime/Weapons/CPowerBeam.hpp"
+#include "MetroidPrime/Weapons/CPowerBomb.hpp"
 #include "MetroidPrime/Weapons/CWaveBeam.hpp"
 #include "MetroidPrime/Weapons/GunController/CGunMotion.hpp"
 #include "MetroidPrime/Weapons/WeaponTypes.hpp"
@@ -157,7 +158,7 @@ CPlayerGun::CPlayerGun(TUniqueId playerId)
 , x330_chargeState(kCS_Normal)
 , x334_(0)
 , x338_nextState(kNS_StatusQuo)
-, x33c_phazonBeamState(kKBS_Inactive)
+, x33c_phazonBeamState(kPBS_Inactive)
 , x340_chargeBeamFactor(0.f)
 , x344_comboXferTimer(0.f)
 , x348_chargeCooldownTimer(0.f)
@@ -667,7 +668,110 @@ CPlayerGun::CGunMorph::EMorphEvent CPlayerGun::CGunMorph::Update(float inY, floa
   return ret;
 }
 
-void CPlayerGun::UpdateWeaponFire(float, CPlayerState&, CStateManager&) {}
+void CPlayerGun::UpdateWeaponFire(float dt, CPlayerState& playerState, CStateManager& mgr) {
+  u32 oldFiring = x2ec_lastFireButtonStates;
+  x2ec_lastFireButtonStates = x2f4_fireButtonStates;
+  u32 pressedStates = x2f4_fireButtonStates & (oldFiring ^ x2f4_fireButtonStates);
+  x2f0_pressedFireButtonStates = pressedStates;
+  u32 releasedStates = oldFiring & (oldFiring ^ x2f4_fireButtonStates);
+  x832_28_readyForShot = false;
+
+  CPlayer& player = *mgr.Player();
+  if (!x832_24_coolingCharge && !x834_30_inBigStrike) {
+    float coolDown = x72c_currentBeam->GetWeaponInfo().x0_coolDown;
+    if ((pressedStates & 0x1) == 0) {
+      if (x390_cooldown >= coolDown) {
+        x390_cooldown = coolDown;
+        if (player.GetMorphballTransitionState() == CPlayer::kMS_Unmorphed &&
+            playerState.ItemEnabled(CPlayerState::kIT_ChargeBeam) &&
+            player.GetGunHolsterState() == CPlayer::kGH_Drawn &&
+            player.GetGrappleState() == CPlayer::kGS_None &&
+            playerState.GetTransitioningVisor() != CPlayerState::kPV_Scan &&
+            playerState.GetCurrentVisor() != CPlayerState::kPV_Scan &&
+            (x2ec_lastFireButtonStates & 0x1) != 0 && x32c_chargePhase == kCP_NotCharging) {
+          x832_28_readyForShot = true;
+          pressedStates |= 0x1;
+          x390_cooldown = 0.f;
+        }
+      }
+    } else if (x390_cooldown >= coolDown) {
+      x832_28_readyForShot = true;
+      x390_cooldown = 0.f;
+    }
+    x390_cooldown += dt;
+  }
+
+  if (x834_28_requestImmediateRecharge)
+    x834_28_requestImmediateRecharge = (x2ec_lastFireButtonStates & 0x1) != 0;
+
+  if (player.GetMorphballTransitionState() == CPlayer::kMS_Morphed) {
+    x835_28_bombReady = false;
+    x835_29_powerBombReady = false;
+    if (!x835_31_actorAttached) {
+      x835_28_bombReady = true;
+      if (x53a_powerBomb != kInvalidUniqueId && !mgr.CanCreateProjectile(x538_playerId, kWT_PowerBomb, 1)) {
+        const CPowerBomb* pb = static_cast<const CPowerBomb*>(mgr.GetObjectById(x53a_powerBomb));
+        if (pb && pb->GetCurTime() <= 4.25f) {
+          x835_28_bombReady = false;
+        } else {
+          x53a_powerBomb = kInvalidUniqueId;
+        }
+      }
+      if (((pressedStates & 0x1) != 0 || x32c_chargePhase != kCP_NotCharging) &&
+          playerState.HasPowerUp(CPlayerState::kIT_MorphBallBombs)) {
+        if (x835_28_bombReady)
+          DropBomb(kBW_Bomb, mgr);
+      } else if (playerState.HasPowerUp(CPlayerState::kIT_PowerBombs) &&
+                 playerState.GetItemAmount(CPlayerState::kIT_PowerBombs) > 0) {
+        x835_29_powerBombReady = mgr.CanCreateProjectile(x538_playerId, kWT_PowerBomb, 1) &&
+                                 mgr.CanCreateProjectile(x538_playerId, kWT_Bomb, 1);
+        if ((pressedStates & 0x2) != 0 && x835_29_powerBombReady)
+          DropBomb(kBW_PowerBomb, mgr);
+      }
+    }
+  } else if ((x2f8_stateFlags & 0x8) != 0x8 &&
+             player.GetMorphballTransitionState() == CPlayer::kMS_Unmorphed) {
+    if ((pressedStates & 0x2) != 0 && x318_comboAmmoIdx == 0 && (x2f8_stateFlags & 0x2) != 0x2 &&
+        x32c_chargePhase == kCP_NotCharging) {
+      u32 missileCount = playerState.GetItemAmount(CPlayerState::kIT_Missiles);
+      if (x338_nextState != kNS_EnterMissile && x338_nextState != kNS_ExitMissile) {
+        if (playerState.HasPowerUp(CPlayerState::kIT_Missiles) && missileCount > 0) {
+          x300_remainingMissiles = missileCount;
+          if (x300_remainingMissiles > 5)
+            x300_remainingMissiles = 5;
+          if (!x835_25_inPhazonBeam) {
+            x2f8_stateFlags &= ~0x1;
+            x2f8_stateFlags |= 0x6;
+            x318_comboAmmoIdx = 1;
+            x31c_missileMode = kMM_Active;
+          }
+          FireSecondary(dt, mgr);
+        } else {
+          if (!CSfxManager::IsPlaying(x2e4_invalidSfx)) {
+            x2e4_invalidSfx = NWeaponTypes::play_sfx(1781, x834_27_underwater, false, 0x4a);
+          } else {
+            x2e4_invalidSfx.Clear();
+          }
+        }
+      }
+    } else {
+      if (x3a4_fidget.GetState() == CFidget::kS_NoFidget) {
+        if ((x2f8_stateFlags & 0x10) == 0x10 && x744_auxWeapon->IsComboFxActive(mgr)) {
+          if (x2ec_lastFireButtonStates == 0 ||
+              (x310_currentBeam == CPlayerState::kBI_Wave && x833_29_pointBlankWorldSurface)) {
+            StopContinuousBeam(mgr, (x2f8_stateFlags & 0x8) == 0x8);
+          }
+        } else {
+          if (mgr.GetPlayerState()->ItemEnabled(CPlayerState::kIT_ChargeBeam) &&
+              x33c_phazonBeamState == kPBS_Inactive)
+            ProcessChargeState(releasedStates, pressedStates, mgr, dt);
+          else
+            ProcessNormalState(releasedStates, pressedStates, mgr, dt);
+        }
+      }
+    }
+  }
+}
 
 void CPlayerGun::ResetIdle(CStateManager& mgr) {
   CFidget::EState fidgetState = x3a4_fidget.GetState();