The Magnificent Seven - Watch Order: Original Timeline
The four films from 1960-1972 form a loosely connected series centered around the character of Chris Adams, though the connections become increasingly tenuous with each sequel. Yul Brynner returns as Chris Adams in the first sequel, but the character is then recast with George Kennedy and Lee Van Cleef in subsequent films, with each actor bringing their own interpretation to the role.
While the character name provides continuity, each sequel essentially functions as a standalone story with a mostly new supporting cast and fresh mission. The films are more thematically linked than narratively connected, each exploring variations on the concept of assembling a team of skilled fighters to protect the vulnerable against powerful antagonists.

Return of the Seven
Chico, one of the remaining members of The Magnificent Seven, now lives in the town that they (The Seven) helped. One day someone comes and takes most of the men prisoner. His wife seeks out Chris, the leader of The Seven for help. Chris also meets Vin another member of The Seven. They find four other men and they go to help Chico.

Guns of the Magnificent Seven
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.

The Magnificent Seven Ride!
Marshal Chris Adams turns down a friend's request to help stop the depredations of a gang of Mexican bandits. When his wife is killed by bank robbers and his friend is killed capturing the last thief, Chris feels obligated to take up his friend's cause and recruits a writer and five prisoners to destroy the desperadoes.The last in the original series of four "Magnificent Seven" movies.
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