The accused pleaded guilty to two counts of robbery while armed with a firearm and one count of being disguised with intent.
The robberies occurred over a six-day period in June 2010, targeting four convenience stores in Toronto.
The accused participated in the robberies as part of a group, though he did not handle the firearm or directly participate in the violence.
The court imposed a sentence balancing denunciation and deterrence against the accused's youth, remorse, cooperation with police, and rehabilitation prospects.