Do the same code of this super knife and change "CSW_KNIFE" -> "CSW_DEAGLE"
PHP Code:
if ( iInflictor == iAttacker && IsPlayer ( iAttacker ) && get_user_weapon ( iAttacker ) == CSW_KNIFE && q_bKnife[ iAttacker ] )
SetHamParamFloat ( 4, fDamage * 3.0 );