During his more than four decades in power, Col. Muammar el-Qaddafi of Libya was North Africa’s outrageously self-styled arms benefactor, a donor of weapons to guerrillas and terrorists around the world fighting governments he did not like.

Even after his death, the colonel’s gunrunning vision lives on, although in ways he probably would have loathed.

Many of the same people who chased the colonel to his grave are busy shuttling his former arms stockpiles to rebels in Syria. The flow is an important source of weapons for the uprising and a case of bloody turnabout, as the inheritors of one strongman’s arsenal use them in the fight against another.

Evidence gathered in Syria, along with flight-control data and interviews with militia members, smugglers, rebels, analysts and officials in several countries, offers a profile of a complex and active multinational effort, financed largely by Qatar, to transport arms from Libya to Syria’s opposition fighters. Libya’s own former fighters, who sympathize with Syria’s rebels, have been eager collaborators.