Copy this block of text ONLY and replace the Deagle's values with it, do not replace your entire WeaponInfo.xml with it.
<weapon type="DEAGLE">
		<data slot="HANDGUN" firetype="INSTANT_HIT" damagetype="BULLET" group="PISTOL_LARGE" targetrange="120.0" weaponrange="120.0" clipsize="9" ammomax="1500" timebetweenshots="333">
			<damage base="60" networkplayermod="4.0" networkpedmod="1.0"/>
			<physics force="95.0"/>
			<reload time="2000" fasttime="2000" crouchtime="2000"/>

			<aiming accuracy="1.25">
				<offset         x="0.15" y="1.0" z="0.55"/>
				<crouchedoffset x="0.2"  y="1.0" z="0.05"/>
				<reticule standing="0.6" ducked="0.5" scale="0.3"/>
			</aiming>

			<pickup regentime="240000" ammoonstreet="30"/>

			<controller>
				<rumble duration="150" intensity="0.1"/>
			</controller>

			<flags>
				<flag>GUN</flag>
				<flag>CAN_AIM</flag>
				<flag>CAN_FREE_AIM</flag>
				<flag>ANIM_RELOAD</flag>
				<flag>ANIM_CROUCH_FIRE</flag>
			</flags>
		</data>

		<assets model="w_eagle">
			<anim group="gun@deagle" meleegroup1="firearm_core"/>

			<effects>
				<muzzle fx="muz_pistol_large"/>
				<shell fx="weap_ejected_pistol"/>
			</effects>
		</assets>
	</weapon>
