Wyatt Earp was Not a Gunslinger—he was a Lawman and a good Republican. He did have a long barreled Colt pistol he used more to club people over the head than shoot—He called it the Buntline Special but no evidence that Ned Buntline ever heard of it (if he had he would have used it in one of his dime novels). Now Doc Holiday—The Dentist from Hell—was a gunsinger! Only curtailed his murderious habits out of his deep friendship with Wyatt. But at OK Corral he was deputized.
I recall reading years ago that Wyatt Earp was carrying a S&W American .44 during the shootout, not a Colt Frontier .45.
Earp never caller it such a thing, nor used a long barreled gun. Ned Buntline gave long barreled Colts to famous people. Earp got one but said he had the barrel shortened to 5 1/2" because the long barrel was silly. . . There were records at the Colt factory of Buntline ordering several long barrel SA revolvers. It is unknown who else Buntline gave the others to. . . or if he did.