For the M82A3 , you need to copy this in your Weaponinfo.xml :





	<weapon type="M40a1">
		<data slot="SNIPER" firetype="DELAYED_HIT" damagetype="BULLET" group="RIFLE_SNIPER" targetrange="50.0" weaponrange="800.0" clipsize="10" ammomax="100" timebetweenshots="400">
			<damage base="75" fps="75" networkplayermod="2.0" networkpedmod="1.0"/>
			<physics force="0.001"/>
			<reload time="9000" fasttime="2066" crouchtime="2066"/>

			<aiming accuracy="0.66" accuracyfps="0.20">
				<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="20"/>

			<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@rifle">
                                <rates firerate="1.5" blindfirerate="1.0"/>
                        </anim>

			<effects>
                                <muzzle fx="muz_P90"/>
				<shell fx="weap_ejected_rifle"/>
			</effects>
		</assets>
	</weapon> 


