For a long time, MacGyver has been against the use of guns, and in this episode, we were show a full flashback of why. We knew why earlier, but this was much more information. His best friend Jessee was accidentally killed by a gun, because it was knocked out of a friend's hand and it went off after hitting the ground.
This episode is part flashback and part real-time. Mac goes to Minnesota to dig up a time capsule, as he and his friends agreed to do one day. They're all a little hesitant to do so. It turns out that their kids are now wrapped up with a drug dealer, and he wants his money. The last 20-25 minutes of the show are a bit more intense, what with guns going off and whatnot.