As a boy, Shamrock's parents were killed. He took possession of a pistol belonging to his father, a famous marshal. Now that he is grown, he takes the job of marshal and uses the same gun, but he still has to solve the mystery of what happened to his parents.
When Billy Carson's uncle is lynched as a supposed rustler, Billy arrives looking for the murderers. He finds that Steve Kirby holds a forged note on his Uncle's ranch. When Kirby sees that Billy means trouble for him, he has him framed for murder. Then just as he is inciting the mob to lynch him, Billy's new friend Doc Jones is trying to break him out of jail.
Charles Starrett stars in the lightning-paced Columbia western Riding West. Somebody is planning to sabotage the new Pony Express mail service, and hard-ridin' Steve Jordan (Charles Starrett) aims to find out who.
Andy Barden, Edna Jordan, and Dan Murdock are the three claimants to the valuable mine of the late Abner Ferrige. Edna takes possession but Murdock gets her to leave and while the three are away his men take possession. But when the Lawyer arrives to announce that Ferrige never filed, everyone rushes off to be the first at the claims office.
Hughie Mack, a not so nice western singer, is discovered by Clover Doyle as the next movie cowboy hero. His name is changed to Slim Carter and a promotional buildup begins. Leo Gallaher, an orphan boy wins the contest to spend a month with Slim. Leo is a good influence on his cowboy hero. Clover sees the good and more in Slim. Montana Burriss is Slim's double.
Bob Warner sells some cattle to two men who later drug him and rob him of the sale money. He takes a job with a medicine show as a barker, offering a reward to any spectator to last three rounds in fighting him. While in the ring, he notices in the audience the two men who stole his money. He knocks out his contestant, pursues the crooks, and recovers the money.
Buffalo is banished to the wilderness after playing a nasty practical joke on his rancher father. During his exile, Billy meets and falls in love with pretty Patricia Farris, who sadly rejects him when he tries to steal a kiss.
Prison escapee Utah Evans kills Sheriff McClay. Joe Norton was McClay's predecessor and sent Utah to prison. Ma McClay having taken over as Sheriff for her husband, now gets Joe to return. Joe sets out to get Utah and Utah, learning Joe is after him, hopes to get revenge for being sent to prison.
Christina, the daughter of a Greek-immigrant family who does not share their belief that a woman's place is with her husband at the fireside, is a trick-shot artist. With her Uncle Jim, a strolling troubadour, and his sidekick Andy, a mandolin player, heads west to make her fortune.
Verdugo finds a young boy on the desert and raises him as his son. Now a grown man, Dan is framed for a stagecoach robbery by Brent, the same man that shot his father and tried to take him and his mother away twenty years earlier.
A gang of crooks kills a gold miner while trying to find out the location of the mine. They then terrorize the miner's son to get him to reveal the mine's location.
Tex Robbins, a Texas Ranger, posing as "Wolf" Cassidy, a notorious Chicago gangster, works his way into the rustling gang and hideout of "Three-Star" Henley, but his plans go wrong and he has to fight his way to victory.
Brokaw, the Polka Dot Bandit, asks Farrell to help rob Wells Fargo. Farrell plans to capture Brokaw for the reward but is assumed to be one of the bandits and shot. Brent captures Brokaw, but Ann thinking her father is in on the robbery lets him go. Brent catches up with him only to be framed when the polka dot bandanna is found on his saddle.
Cowboy star Buck Jones made his directorial debut with the Universal western For the Service. Jones is cast as Indian scout Buck O'Bryan, trying his best to keep the peace between the Native Americans and a government outpost. O'Bryan is replaced by George Murphy, the son of commanding officer Captain Murphy. Obviously unqualified for his job, Murphy proves himself a coward and a weakling, forcing O'Bryan to take over when the fort is besieged by outlaw Bruce Howard and his gang.