TAC-300
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the TAC-300 model convert from Medal of Honor Warfighter to GTAIV by cjisntgay
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REMEMBER TO BACKUP YOUR FILES!!!!!!!
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Install the model:

open sparkIV or openIV, browse to your GTAIV main folder/pc/models/cdimages/weapons.img, import w_rifle.wdr and w_rifle.wtd then save!

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THE information you have to replace in weaponinfo.xml, you'll find these words in your weaponinfo.xml

	<weapon type="M40a1">
		<data slot="SNIPER" firetype="DELAYED_HIT" damagetype="BULLET" group="RIFLE_SNIPER" targetrange="50.0" weaponrange="1500.0" clipsize="5" ammomax="50" timebetweenshots="333">
			<damage base="20" fps="75" networkplayermod="2.0" networkpedmod="1.0"/>
			<physics force="100.0"/>
			<reload time="1300" fasttime="2066" crouchtime="2066"/>

			<aiming accuracy="10.0" accuracyfps="0.0">
				<offset         x="0.16" y="1.0" z="0.55"/>
				<crouchedoffset x="0.16" y="1.0" z="0.12"/>
				<reticule standing="0.6" ducked="0.5" scale="0.05"/>
			</aiming>

			<pickup regentime="360000" ammoonstreet="10"/>

			<controller>
        <rumble duration="120" intensity="0.3"/>
			</controller>

			<flags>
				<flag>GUN</flag>
				<flag>CAN_FREE_AIM</flag>
				<flag>FIRST_PERSON</flag>
				<flag>ANIM_RELOAD</flag>
				<flag>ANIM_CROUCH_FIRE</flag>
				<flag>2HANDED</flag>
			</flags>
		</data>

		<assets model="w_rifle">
			<anim group="gun@m40a1"/>
		</assets>
	</weapon>
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Then changed to these words:

<weapon type="M40a1">
		<data slot="SNIPER" firetype="DELAYED_HIT" damagetype="BULLET" group="RIFLE_SNIPER" targetrange="600.0" weaponrange="3600.0" clipsize="5" ammomax="4500" timebetweenshots="333">
			<damage base="650" fps="75" networkplayermod="2.0" networkpedmod="1.0"/>
			<physics force="380.0"/>
			<reload time="1300" fasttime="2066" crouchtime="2066"/>

			<aiming accuracy="10.0" accuracyfps="0.0">
				<offset x="0.16" y="1.0" z="0.55"/>
				<crouchedoffset x="0.16" y="1.0" z="0.12"/>
				<reticule standing="0.6" ducked="0.5" scale="0.05"/>
			</aiming>

			<pickup regentime="360000" ammoonstreet="10"/>

			<controller>
				<rumble duration="120" intensity="0.3"/>
			</controller>

			<flags>
				<flag>GUN</flag>
				<flag>2HANDED</flag>
				<flag>ANIM_RELOAD</flag>
				<flag>CAN_FREE_AIM</flag>
				<flag>FIRST_PERSON</flag>
				<flag>ANIM_CROUCH_FIRE</flag>
			</flags>
		</data>

		<assets model="w_rifle">
			<anim group="gun@m40a1"/>
			<effects>
				<muzzle fx="muz_machine"/>
			</effects>
		</assets>
	</weapon>