More than 4,500 guns have been collected, including 90 assault weapons.
Collecting guns is a start, but the mother of one gun-violence victim says teens can go a step further to put a stop to violence.
"Start snitching. Start telling before it's too late and your mother is standing up here like I am full of pain with no hopes and dreams. It could be your mother up here burying you the next day," said Anette Holt, mother of Blair Holt, a Chicago teen who was gunned down.
The gun turn-in was so popular that some locations ran out of the pre-paid credit cards. Rain checks were expected to be issued.
For a complete list of locations where you can turn in guns, click here.