What is going on with the bottom rifle in these photo's ?

.22lr?

Custm job for a leftie?

The .22 short rifles loaded like a regular tube .22 so no loading gate.

It's not a 66 clone is It?

Google search indicates .22.

I'd say it's a tube loaded .22 lr.  They don't use loading gates.  .22 lr ammo doesn't do well being stuffed into a tube from an angle.  The heel type bullet tends to loose it's grip on the case.

It could be a larger caliber rimfire that loads through the front of the tube (photos aren't really sufficient).  Since many of the early levers ejected out the top you don't need an ejection port like the Marlins have.

Okay, I should have just looked at my Winchester book first.

It is a Winchester 1873 .22 lr.  And as mentioned, it stuffs from the from of the tube (think current Henry rifles).  It ejects out the top.

Where did you get the images?

It's an 1873 in 22 Short.

Here's mine made in 1890 - works great .......

That is a lot of rifle for such a little itty bitty cartridge!!!