Remington  Split Breech single shot civil war carbine .

Remington  Split Breech single shot civil war carbine . Flayderman P 178/179, item 5E 079.  Cal 50 Rimfire. 

this is the rare Type II, having only 4 screws visible on right side of frame( type I has 7).

Most were resold by the US army to remington who sold them for the Franco Prussian War, to france. 
This one has no  US military  proofmark on the stock, , buttplate is not s marked, bore is completely mint, seems unfired. otherwise dark grey patina, stock has no splits or cracks. . virtually no dings on the stock.  Works perfect.