Officer Carbine?

[CMichaud]

Saw this on the EE.

I am no expert but I have never seen nor heard of one of these.

http://www.canadiangunnutz.com/forum/showthread.php/1206881-Very-rare-snider-carbine

Is this legit?

 

[Cocked&Locked]

id think it's a cavalry or artillery unit, but I'm not expert either. Looks like it would be fun to shoot though!

 

[green]

Looks like a Cavalry Carbine barrel and action fitted to a shortened long rifle stock. It corresponds with no Known issue Snider model.
It is ordnance and govt marked as befits a service for issue. Until WWI officers bought their own arms and accoutrements.
Highly speculative.