Here are some comparison pictures, along with my commentary.
This is a USGI M1 Carbine (picture from Wikipedia):

Pros: N/A
Cons: N/A
This is a Chiappa/Citadel/Legacy M1-22 (Model #500.082), with proprietary 10-round magazine (my picture):

Pros: most resembles a genuine M1 Carbine in form/function
Cons: it’s not a Ruger 10/22 (i.e. reliability/track record, after-market, etc)
This is my M1 Carbine “clone” built off a Ruger 10/22, customized with Sarco M1 carbine stock, Ruger 10/22 M1 Carbine front sight (see previous posts), Sarco M1 Carbine rear sight (modified to take a Ruger scope/rail screw and screwed into the rear-most factory-drilled/tapped hole of the receiver), 1022FunGun magazine extension on a standard Ruger 10-round rotary magazine, Sarco sling/oiler, and Sarco magazine pouch) (my picture):

Pros: it’s a Ruger 10/22; the sights better resemble actual M1 Carbine sights
Cons: not as authentic as the Chiappa; the rear sight is a DIY project
This is my M1 Carbine “clone” built off a Ruger 10/22, customized with Sarco M1 Carbine stock, Tech Sights’ TSR100 front and rear sights, 1022FunGun magazine extension on a standard Ruger 10/22 10-round rotary magazine, and Sarco sling/oiler (my picture):

Pros: it’s a Ruger 10/22; Tech Sights are legitimately designed for the 10/22
Cons: not as authentic as the Chiappa; the sights don’t resemble M1 Carbine sights
Finally, this is Ruger’s 10/22 M1 Carbine (Model #21102) (picture from Ruger website):

Pros: it’s a Ruger 10/22; comes straight from the factory like this
Cons: not as authentic as the Chiappa; that rear sight + rail…
Hope this helps others with their buying/build decisions.