NightHawk Crossing by C. Edgar North

On the Pacific Northwest border, large-scale smuggling is controlled by a motorcycle gang led by Joseph Branson, an ex-Navy SEAL and Chief of an Indian Band. Their successful operation draws the attention of the FBI when Joseph ambushes and kills two Border Patrol agents using a highly classified weapon. When the same type of weapon turns up in the hands of the Taliban and Al Qaida, the FBI and the CIA are tasked to identify the source - which turns out to be a factory the Chief has set up in partnership with the inventor and a Russian arms dealer. Follow the action as the gang battles the FBI and distributes their arms to jihadists in Afghanistan.