Go to your Freestylegunz folder, (dont know where located at your pc)
Search for config.xml, open it with notepad.
Replace your old video settings, with this one.
You can edit WIDTH and HEIGHT to<VIDEO>
<WIDTH>640</WIDTH>
<HEIGHT>480</HEIGHT>
<COLORBITS>8</COLORBITS>
<GAMMA>255</GAMMA>
<FULLSCREEN>TRUE</FULLSCREEN>
<REFLECTION>false</REFLECTION>
<LIGHTMAP>false</LIGHTMAP>
<DYNAMICLIGHT>false</DYNAMICLIGHT>
<SHADER>false</SHADER>
<CHARACTORTEXTURELEVEL>2</CHARACTORTEXTURELEVEL>
<MAPTEXTURELEVEL>8</MAPTEXTURELEVEL>
<EFFECTLEVEL>0</EFFECTLEVEL>
<TEXTUREFORMAT>8</TEXTUREFORMAT>
<NHARDWARETNL>false</NHARDWARETNL>
</VIDEO>
For a bigger screen, save & close now.<WIDTH>1024</WIDTH>
<HEIGHT>768</HEIGHT>
By the way, if you edit something ingame options, your config.xml wil be resetted and you have to do this steps again..
Greetings,
Weezy