Via the forum: 

4. Guns are sort of useless: expensive, weak, and you get them late in the game;
by the time you are in the red guard you are more powerful than all the guns are
(antique sword - found 3x of them)

https://sourceforge.net/apps/phpbb/freedroid/viewtopic.php?f=20&t=152

See also http://bugs.freedroid.org/b/issue508.

Closing this one in favor of Xenux's which has a list of things to do to resolve
the issue.