Finger on the Trigger (also known as Blue Lightning) is a 1965 Western film directed by Sidney W. Pink and starring Rory Calhoun. It was distributed on VHS by Troma Entertainment. At the end of the American Civil War, a group of discharged federal troops travel west to California to settle the free land offered by the US Government to honorably discharged veterans. These veterans clash with a band of renegade Confederates in a deserted town in Oklahoma.