Mossberg 500 vs Mossberg 590

[Proshot]

What is the difference between the two shotguns?
Thanks,
Proshot

 

[C Philip]

http://en.wikipedia.org/wiki/Mossberg_500#Model_500_vs._Model_590_vs._Model_590A1
http://www.shotgunworld.com/bbs/viewtopic.php?t=2431