When Clint Adams rides into Abilene, he meets up with an old friend who happens to be the new marshal. There's big trouble brewing with a gang of young outlaws -- and only the Gunsmith has the guts to deal with them head on.
The synopsis above is not for "Pay Dirt," not sure which Gunsmith book it refers to, but it is certainly not this one. The first paragraph on the back cover of "Pay Dirt" reads: After discovering an extra thousand dollars in his bank account, Clint Adams receives instructions to go to the one-horse town of Bended Knee, Arkansas. Upon arrival, he discovers that various members of the Cahill clan run most of the businesses. The patriarch of the family was a career outlaw who supposedly buried his loot in town -- but the Cahills have been unable to find it.
This is a decent entry in the series with Bat Masterson and Luke Short also showing up in Bended Knee, and they and Adams eventually figure out that someone, not a Cahill, had lured them there to end their lives.