NASHUA – A prospective member of an outlaw motorcycle gang has received a rare maximum sentence for assault following the shooting of a teen after a melee at a pizza joint last year.

Kristofer Haken, 32, formerly of Londonderry, was sentenced to 10-20 years in prison by Hillsborough County Superior Court Judge Gillian Abramson on Wednesday.

Haken had pleaded guilty to second-degree assault for shooting a high school student during a gang turf war at Luigi’s Pizza Bar and Grill in Manchester, said Hillsborough County Attorney Dennis Hogan.

Police were called to the restaurant at 712 Valley St. around 8:30 p.m. April 16, 2010, after what Hogan described as a “tense confrontation.”

Members of two motorcycle gangs, the Hell’s Angels and the Outlaws, began fighting in the parking lot, and the bar’s owner, Petros Kostakis, fired several rounds from a handgun into the air to try to break up the melee, Hogan said.

Shortly after that, Haken, who was a prospective member of one of the motorcycle groups, went to the vehicle of his girlfriend, Alica Cote, and retrieved a 20-gauge shotgun, got into the passenger seat and fired the gun out the window as Cote drove away, Hogan said.

The blast was toward three high school boys, who were unconnected to the gangs, and hit one of them in the hand and leg, causing serious injuries, Hogan said.

At the sentencing hearing on Wednesday, Haken’s lawyers presented evidence that he suffered from post-traumatic stress disorder after serving in the military in Afghanistan and Iraq, Hogan said.

But Manchester Police Chief David Mara testified at the hearing – also a relatively rare occurrence – that a long sentence would send a message that Manchester won’t tolerate gang violence, Hogan said.

Abramson sentenced Haken to the maximum sentence for the felony assault charge, suspending 21?2 years of the minimum term, Hogan said.

Assistant County Attorney Kenneth Perkes prosecuted the case, Hogan said.

Joseph G. Cote can be reached at 594-6415 or jcote@nashuatelegraph.com.