This packet of new crosshairs contains several modern weaponry crosshairs including the M16, MP5, AK-47, G36, M14, and several other crosshairs that I came up with. (For full effect the Sauerbraten crosshair size should be set to 30-45)

INSTRUCTIONS: Download the zip, extract it, and copy everything in the blargh folder to sauerbraten/packages/crosshairs, then open sauerbraten and type the following into the autoexec.cfg:
exec packages/crosshairs/gunz.cfg

Enjoy!