As Tuzo said
The Winchester Model 1892 is the signature weapon of Lucas McCain (Chuck Connors). The famous opening shows Lucas firing 12 shots from his Winchester in less than 5 seconds! The rifle is fitted with a large lever loop to allow one hand reloading. There were actually 3 prop weapons used on the show, 2 true Winchesters and a Spanish El Tigre used for stunts.
Always liked at the beginning of the show when he fires those 12 shots he's wearing gloves, that loop would have been heck on his knuckles without them.