Tried to change NPC XML values?
Like
<attack physical="16.20165" magical="11.06363" random="30" critical="4.75" accuracy="4.75" attackSpeed="250" type="SWORD" range="40" distance="80" width="120" />
->
<attack physical="16.20165" magical="11.06363" random="30" critical="4.75" accuracy="4.75" attackSpeed="250" type="BOW" range="1400" distance="80" width="120" />