Finger on the Trigger (also known as Blue Lightning) is a 1965 Western film directed by Sidney W. Pink and starring Rory Calhoun.

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.

The film was meant to star Victor Mature but he pulled out.

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