would this be legal in CLA?

Tubular magazine ??

yep, that's a round magazine

No, It needs to be a tubular feed rifle. This is just a revolver with a long barrel.
PPKNY

with a tubular magazine

That carbine could likely be used as a "club gun".

It should be...

Use it if you already have one, but you won't be winning any titles with it. There is reason those haven't caught on in 150 years

No tubular magazine, not a lever action, pump, or semi-auto.

That's like 0 for 4.

Definition of tubular

1a : having the form of or consisting of a tube a tubular calyx
b : made or provided with tubes
2 : of, relating to, or sounding as if produced through tubes

it's round, the bullets go in tubes. Like a fixed 1022 mag.

pull the lever on top and it loads the next round.....I'm seein some gray.

can't attest to the accuracy.......

lever noun
le·​ver | \ ˈle-vər
, ˈlē-
\
Definition of lever

(Entry 1 of 2)
1a : a bar used for prying or dislodging something
b : an inducing or compelling force : tool use food as a political lever — Time
2a : a rigid piece that transmits and modifies force or motion when forces are applied at two points and it turns about a third specifically : a rigid bar used to exert a pressure or sustain a weight at one point of its length by the application of a force at a second and turning at a third on a fulcrum
b : a projecting piece by which a mechanism (see mechanism sense 1) is operated or adjusted

I wouldn’t want to shoot beside that on the firing line.

Ever seen someone shoot a revolver with the support hand wrapped around the cylinder?

This would require a different hold than I use now!

Hugh, I think you fail at the hurdle of "tubular magazine".
A revolver cylinder will never be a magazine in the sense of the word. It is, in fact, a number of chambers from which each cartridge is fired.
A tubular magazine stores a number of cartridges stacked in line, one before/behind the other. The lever action rifle has one chamber only.

tHIS DISCSION IS FOOLISH

Foolish - yes, but it's all we've got..... and people like to discuss "something".