Mann is a gunman informed by a childhood friend that his father was murdered years earlier by his mother and her lover. To make matters worse, Mann's sister, who is in love with his friend, is held under the thumb of his murderous mom. The two gunmen ride off to have a reckoning with her.
A peace-loving man named Ben Kane takes a job as deputy marshal of Lords, in the old West. Kane is no lawman, but he accepts the badge because he has an old score to settle with the town's chief trouble-maker. Once on the job, Kane must also deal with a young sharpshooter named Billy Young and a sharp and sassy saloon dancer, Lily.
As the west rapidly becomes civilized, a pair of outlaws in 1890s Wyoming find themselves pursued by a posse and decide to flee to South America in hopes of evading the law.
Several pillars of society have robbed an Army safe containing $100,000 so they can buy the land upon which the coming railroad will be built. But they haven't reckoned on the presence of the master gunslinger, Sabata.
Passing through a town, a farm boy aspiring to be a bounty hunter rescues a woman who has been tricked into working in its brothel and the two travel towards his father's ranch.
After his girlfriend dies in childbirth, Confederate deserter John Warner travels to Mexico, where the woman's father, Don Pedro Sandoval, grudgingly hands over his child. But with no locals willing to provide milk, the baby dies. Rounding up a group of rebels, Warner goes on a rampage through northern Mexico, with the ultimate goal of taking down Sandoval in this gritty Western.
When Quintero, a Mexican revolutionary leader, is left to rot in jail by the forces of President Diaz, it's up to his subordinate, Max, to bust him out. With $600 in hand, he crosses the border into America and hires Chris Adams, a mercenary of considerable skill, who uses the rest of the cash on more hired guns. After the team is rounded out by experts on close-combat fighting, explosives, and knife-throwing, they set off to free Quintero.
Don Juan, the governor of a Mexican province, arrests Manuel, the fiancé of the beautiful heiress, Virginia. When Quintana frees Manuel, Don Juan kidnaps Virginia to force her hand in marriage. The ceremony is interrupted in a violent battle.
Renegade Confederate soldiers take over a frontier town, but after they molest a young black woman, a group of ex-slaves arm themselves and counter-attack.
Photographed by famed cinematographer Laszlo Kovacs just before embarking on EASY RIDER (1969), Mark of the Gun is a classic western tale of outlaws and the women they love.
When the multiple murderer Cain is released from prison after 18 years, he wants to settle down as a rancher and never touch a gun again. But his former life haunts him; not only that nobody wants to give him a job, some villains also want to pay him back. So he has to accept the offer of showman Ruffalo to perform as "Killer Cain" in his traveling shooting show. However after 18 years without practice even Ruffalo's young assistant Billy shoots better than Cain.
During the American Civil War, a Confederate prisoner, Clyde McKay, attempts to steal a box of gold from a Union prison camp. He is aided by a group of prisoners and a prison guard but he is double-crossed along the way.
As the railroad builders advance unstoppably through the Arizona desert on their way to the sea, Jill arrives in the small town of Flagstone with the intention of starting a new life.
While a Mexican revolutionary lies low as a U.S. rodeo clown, the cynical Polish mercenary who tutored the idealistic peasant tells how he and a dedicated female radical fought for the soul of the guerrilla general Paco, as Mexicans threw off repressive government and all-powerful landowners in the 1910s. Tracked by the vengeful Curly, Paco liberates villages, but is tempted by social banditry's treasures, which Kowalski revels in.