Abstract: | Civil wars are primarily fought with small and light arms, but the availability of major conventional weapons to states and rebels can alter the nature of the war being fought. This study explores the impact of major conventional weapons transfers on civil war severity and duration. By using a recipient based approach to arms transfers, I find rebel acquisition of major conventional weapons from international sources leads to conflict escalation and deadlier conflicts. State importation of major conventional weapons is associated with longer conflicts. These findings provide researchers a means to account for rebel capabilities in civil war research and policy makers insight to limit the destructiveness of civil wars. |