I see in the rules that a weapon is limited to the number of modifications. I see on the overcharger card a triangle around a blaster icon but the rules make reference to colored bars on the bottom right corner of a weapons card. I assume I am looking on the wrong area of a weapons card. What should I be looking for when looking for modification bars?

Look at the bottom right corner of the weapon card.

No modification bar: http://i.imgur.com/HA67Mnw.jpg

1 modification bar: http://i.imgur.com/XhhRy0D.jpg

2 modification bars: http://i.imgur.com/iBHl6QU.jpg