diff --git a/src/game/game.cpp b/src/game/game.cpp
index 1e30101..34bf66d 100644
--- a/src/game/game.cpp
+++ b/src/game/game.cpp
@@ -13,6 +13,8 @@ namespace game
 
 		DB_LoadXAssets_t DB_LoadXAssets;
 
+		Dvar_RegisterBool_t Dvar_RegisterBool;
+
 		Dvar_SetIntByName_t Dvar_SetIntByName;
 
 		Dvar_SetFromStringByName_t Dvar_SetFromStringByName;
@@ -57,6 +59,8 @@ namespace game
 
 		SEH_LocalizeTextMessage_t SEH_LocalizeTextMessage;
 
+		PM_WeaponUseAmmo_t PM_WeaponUseAmmo;
+
 		decltype(longjmp)* _longjmp;
 
 		CmdArgs* sv_cmd_args;
@@ -602,6 +606,8 @@ namespace game
 
 		native::DB_LoadXAssets = native::DB_LoadXAssets_t(SELECT_VALUE(0x48A8E0, 0x4CD020, 0x44F770));
 
+		native::Dvar_RegisterBool = native::Dvar_RegisterBool_t(SELECT_VALUE(0x4914D0, 0x5BE9F0, 0x0));
+
 		native::Dvar_SetIntByName = native::Dvar_SetIntByName_t(SELECT_VALUE(0x5396B0, 0x5BF560, 0x0));
 
 		native::Dvar_SetFromStringByName = native::Dvar_SetFromStringByName_t(
@@ -650,6 +656,8 @@ namespace game
 		native::SEH_LocalizeTextMessage = native::SEH_LocalizeTextMessage_t(
 			SELECT_VALUE(0x41EA20, 0x57E240, 0x0));
 
+		native::PM_WeaponUseAmmo = native::PM_WeaponUseAmmo_t(SELECT_VALUE(0x463F80, 0x42E930, 0x0));
+
 		native::_longjmp = reinterpret_cast<decltype(longjmp)*>(SELECT_VALUE(0x73AC20, 0x7363BC, 0x655558));
 
 		native::sv_cmd_args = reinterpret_cast<native::CmdArgs*>(SELECT_VALUE(0x1757218, 0x1CAA998, 0x1B5E7D8));
diff --git a/src/game/game.hpp b/src/game/game.hpp
index 6479014..bd0dbd6 100644
--- a/src/game/game.hpp
+++ b/src/game/game.hpp
@@ -23,6 +23,10 @@ namespace game
 		typedef void (*DB_LoadXAssets_t)(XZoneInfo* zoneInfo, unsigned int zoneCount, int sync);
 		extern DB_LoadXAssets_t DB_LoadXAssets;
 
+		typedef const dvar_t* (*Dvar_RegisterBool_t)(const char* dvarName, bool value,
+			unsigned __int16 flags, const char* description);
+		extern Dvar_RegisterBool_t Dvar_RegisterBool;
+
 		typedef void (*Dvar_SetIntByName_t)(const char* dvarName, int value);
 		extern Dvar_SetIntByName_t Dvar_SetIntByName;
 
@@ -89,6 +93,9 @@ namespace game
 		typedef char* (*SEH_LocalizeTextMessage_t)(const char* pszInputBuffer, const char* pszMessageType, msgLocErrType_t errType);
 		extern SEH_LocalizeTextMessage_t SEH_LocalizeTextMessage;
 
+		typedef void (*PM_WeaponUseAmmo_t)(playerState_s* ps, const Weapon weapon, bool isAlternate, int amount, PlayerHandIndex hand);
+		extern PM_WeaponUseAmmo_t PM_WeaponUseAmmo;
+
 		extern decltype(longjmp)* _longjmp;
 
 		constexpr auto CMD_MAX_NESTING = 8;
diff --git a/src/game/structs.hpp b/src/game/structs.hpp
index 831da31..7e71567 100644
--- a/src/game/structs.hpp
+++ b/src/game/structs.hpp
@@ -533,6 +533,31 @@ namespace game
 			const char* name;
 		};
 
+		enum dvar_flags : std::uint16_t
+		{
+			DVAR_ARCHIVE = 0x1,
+			DVAR_CHEAT = 0x4,
+			DVAR_CODINFO = 0x8,
+			DVAR_SCRIPTINFO = 0x10,
+			DVAR_SERVERINFO = 0x400,
+			DVAR_WRITEPROTECTED = 0x800,
+			DVAR_READONLY = 0x2000,
+		}; // Incomplete
+
+		enum dvar_type : std::int8_t
+		{
+			DVAR_TYPE_BOOL = 0x0,
+			DVAR_TYPE_FLOAT = 0x1,
+			DVAR_TYPE_FLOAT_2 = 0x2,
+			DVAR_TYPE_FLOAT_3 = 0x3,
+			DVAR_TYPE_FLOAT_4 = 0x4,
+			DVAR_TYPE_INT = 0x5,
+			DVAR_TYPE_ENUM = 0x6,
+			DVAR_TYPE_STRING = 0x7,
+			DVAR_TYPE_COLOR = 0x8,
+			DVAR_TYPE_FLOAT_3_COLOR = 0x9,
+		};
+
 		union DvarValue
 		{
 			bool enabled;
@@ -610,6 +635,33 @@ namespace game
 
 		static_assert(sizeof(usercmd_s) == 0x2C);
 
+		enum PlayerHandIndex
+		{
+			WEAPON_HAND_RIGHT = 0,
+			WEAPON_HAND_LEFT = 1,
+			NUM_WEAPON_HANDS = 2,
+			WEAPON_HAND_DEFAULT = 0,
+		};
+
+		struct Weapon_s
+		{
+			unsigned int padding : 8;
+			unsigned int scopeVariation : 3;
+			unsigned int weaponOthers : 4;
+			unsigned int weaponUnderBarrels : 2;
+			unsigned int weaponScopes : 3;
+			unsigned int weaponIdx : 8;
+			unsigned int weaponVariation : 4;
+		};
+
+		union Weapon
+		{
+			Weapon_s _s_0;
+			unsigned int data;
+		};
+
+		static_assert(sizeof(Weapon) == 4);
+
 		struct playerState_s
 		{
 			unsigned char __pad0[0x4EC];
diff --git a/src/module/player_movement.cpp b/src/module/player_movement.cpp
new file mode 100644
index 0000000..338d264
--- /dev/null
+++ b/src/module/player_movement.cpp
@@ -0,0 +1,51 @@
+#include <std_include.hpp>
+#include "player_movement.hpp"
+
+#include "utils/hook.hpp"
+
+const game::native::dvar_t* player_movement::player_sustainAmmo;
+
+void player_movement::post_load()
+{
+	if (game::is_mp()) this->patch_mp();
+	else if (game::is_sp()) this->patch_sp();
+}
+
+void player_movement::pm_weapon_use_ammo(game::native::playerState_s* ps, const game::native::Weapon weapon,
+	bool is_alternate, int amount, game::native::PlayerHandIndex hand)
+{
+	if (!player_movement::player_sustainAmmo->current.enabled)
+	{
+		game::native::PM_WeaponUseAmmo(ps, weapon, is_alternate, amount, hand);
+	}
+}
+
+const game::native::dvar_t* player_movement::dvar_register_player_sustain_ammo(const char* dvar_name,
+		bool value, unsigned __int16 /*flags*/, const char* description)
+{
+	player_movement::player_sustainAmmo = game::native::Dvar_RegisterBool(dvar_name,
+		value, game::native::DVAR_CODINFO, description);
+
+	return player_movement::player_sustainAmmo;
+}
+
+void player_movement::patch_mp()
+{
+	utils::hook(0x418D9C, &player_movement::dvar_register_player_sustain_ammo, HOOK_CALL).install()->quick();
+
+	utils::hook(0x42B5DA, &player_movement::pm_weapon_use_ammo, HOOK_CALL).install()->quick();
+	utils::hook(0x42B2BD, &player_movement::pm_weapon_use_ammo, HOOK_CALL).install()->quick();
+	utils::hook(0x42AE95, &player_movement::pm_weapon_use_ammo, HOOK_CALL).install()->quick();
+}
+
+void player_movement::patch_sp()
+{
+	player_movement::player_sustainAmmo = game::native::Dvar_RegisterBool("player_sustainAmmo",
+		false, game::native::DVAR_CODINFO, "Firing weapon will not decrease clip ammo");
+
+	utils::hook(0x648C3A, &player_movement::pm_weapon_use_ammo, HOOK_CALL).install()->quick();
+	utils::hook(0x64891D, &player_movement::pm_weapon_use_ammo, HOOK_CALL).install()->quick();
+	utils::hook(0x6484E2, &player_movement::pm_weapon_use_ammo, HOOK_CALL).install()->quick();
+}
+
+REGISTER_MODULE(player_movement);
diff --git a/src/module/player_movement.hpp b/src/module/player_movement.hpp
new file mode 100644
index 0000000..1066761
--- /dev/null
+++ b/src/module/player_movement.hpp
@@ -0,0 +1,21 @@
+#pragma once
+#include "loader/module_loader.hpp"
+#include "game/game.hpp"
+
+class player_movement final : public module
+{
+public:
+	void post_load() override;
+
+private:
+	static const game::native::dvar_t* player_sustainAmmo;
+
+	static void pm_weapon_use_ammo(game::native::playerState_s* ps, const game::native::Weapon weapon,
+		bool isAlternate, int amount, game::native::PlayerHandIndex hand);
+
+	static const game::native::dvar_t* dvar_register_player_sustain_ammo(const char* dvar_name,
+		bool value, unsigned __int16 flags, const char* description);
+
+	static void patch_mp();
+	static void patch_sp();
+};