FourGuysGuns

Me to. I have a 94 in .30-30. Not an old one, but it is a hexagon barrel.

I think it was a sawed-off. Can't do that today of course...

PO3 Bob McCord and TSgt David L. - The 1892 Winchester caliber .44-40 carbine with a standard 20-inch barrel used on the set of The Rifleman appeared with two different types of levers. The backwards, round-D-style loop was used in the early episodes. Sometimes the rifle McCain uses has a saddle ring (the purpose of this ring is to allow the rider to tie the gun with a lanyard, to secure it in the scabbard). The lever style later changed to a flatter lever (instead of the large loop) with no saddle ring.
Gunsmith James S. Stembridge modified two Model 1892s for use in regular and close-up filming.[8] In addition, a Spanish-made Gárate y Anitúa "El Tigre" lever action, a near-copy of the Model 1892, was modified for use as a knockabout gun. The El Tigre is seen in scenes where the rifle is in a saddle scabbard and is not drawn; and in stunts where the rifle was thrown to the ground, used as a club, or in any stunt where there was the possibility of damage to the original Winchester 1892s. These three rifles were the only ones used by Connors during the run of the series.

Since it was the standard 20" barrel, there should not be a problem. But I doubt if you would want to modify one when replicas are available or order one through your favorite gun shop from Winchester. http://www.winchesterguns.com/products/rifles/model-1892/model-1892-current-products/model-1892-large-loop-carbine.html

On top of that, I believe that you are thinking about the 'Mares Leg' from "Wanted - Dead or Alive" used by Steve McQueen. These are available as the Rossi Ranch Hand pistol available through Cabela's.

SSG Robert Webster - Good info. No, I wouldn't want to modify one today. Just saying that you could then, and can't now.

The Mare's Leg was pretty cool. I'd rather have the old .44-40 I think.