Manes, who pleaded guilty to selling the weapon to the teenagers, was also ordered to serve three years for possessing a sawed-off shotgun. The sentences will run concurrently.
During the sentencing hearing, prosecutors gave the first-ever account of some of what the Columbine High School shooters said in the unreleased videotapes they left behind. CBS News' John Blackstone has the story:
Brian Rohrbough came to court to remember the son he lost at Columbine and to learn more about the teenage killers who took his life. Dylan Klebold and Eric Harris left behind a collection of videotapes they created themselves, describing details leading up to the shooting, details Rohrbough has wanted to know for months.
"It's important to me to know everything that happened to my son," he said. "We want to see all the evidence, and at this point, we haven't been able to."
Today, an excerpt from one of the tapes was read in court. In it, Dylan Klebold refers to Manes and another friend who helped them get the most powerful weapon in their arsenal. On the tape, Klebold says, "I'd like to make a thank you to Mark and Phil. It was way cool what you did. I hope you don't get caught. You helped us do what we had to do."
Rohrbough says, "The bullet that killed my son came from this Tec-9, so very much he's an accessory to the murder of my son."
At the sentencing, which was closed to television cameras, families paid tribute to those who were killed and prosecutors say the excerpt read today is the only part of the killers' videos they'll release. They say making the videos public would help the killers achieve the cult status they wanted. But Brian Rohrbough suspects there are other reasons authorities want to keep the tapes secret.
"What I've heard about the tape is that Harris and Klebold are making fun of how inept the Sheriff's department is," Rohrbough said.
With a number of civil cases pending, it seems almost certain that attorneys will demand access to the video diaries of the Columbine killers.
Before sentencing was handed down, Manes said he never wants to see guns again. He said he was unable to adequately express his sorrow to the families of the victims.