Renegades (1989)

"This time, they've brought their guns to the city."

While investigating police corruption in his department, undercover cop Buster McHenry is forced to participate in a heist, leading to innocent casualties and the theft of an ancient Lakota tribal spear. After McHenry ends up severely wounded, he is taken in by Native American Hank Storm, who is out to recover the spear and avenge the death of a loved one in the heist.