Checkout the TKB-022...very ugly
http://world.guns.ru/assault/as94-e.htm
In airsoft world I would say glocks are an abomination-the ugliest guns I know.
Submachineguns-Uzis are quite ugly.
Assault Rifles-Chinese Type 97 is ugliest.
Shotguns-Well, they are mostly similar. I guess the Remington 870 models are kind of ugly.
Sniper Rifles-VSR10- too plain. I like hi-tech look like psg-1 or L-96.
LMGs-RPK with drum mag=UGLY.
I know the famas is ugly but I fell in love with it years ago.