Odd Roller markings
Re: Odd Roller markings
Sounds like it probably started life as a US Navy carbine but they were chambered for .50-45 carbine cartridge. Does the breech block have a small stud in a concave section to act as an extractor? This is characteristic of the Navy carbine.
Re: Odd Roller markings
Without seeing it, it sounds like someone put an 1867 Navy barrel on a later Rolling Block receiver. These barrels were available from Dixie, Numrich or??? until maybe 15 years ago. As long as the bore is good and the head space is correct it should make a good shooter.
Re: Odd Roller markings
The breech block firing pin channel is probably just gunked up. Early Remington Rolling Blocks had a small coil spring to act as a firing pin retractor. Later models did away with that. Gun solvent and q-tips should clean up the channel and maybe a small wire brush on the firing pin. I use a wire wheel in my Dremel tool for cleaning these small, inside parts.