I don't know squat about Sharps rifles, so if there is anybody here whom can shed some light or point me in the right direction regarding this rifle, please chime in.

I got this gun about three months ago and have been able to come up with some information about it.

It looks to be a genuine Christian Sharps 1874. It was either retailed or rebarreled in period by P. Bergersen in Cheyenne Wyoming. I have been able to get some information about Bergersen on the web.
It is chambered in the 40-90 Sharps bottleneck cartridge.
It has a heavy full octagon barrel, double set trigger, an R.S. Lawrence rear sight and a pewter forend tip (the Hartford Collar is what I have read).
There are a couple issues with it, the top tang looks bent up at the rear edge and the hammer looks as though it has been broken and then welded and filed. The stock looks quite short to my eye but I can't say for sure if it has been shortened. Think that is likely though.
The serial number is clear but the Sharps patent stamp is just barely visible on the left side of the action.

Looks to me like a gen-yew-wine Old West buffalo rifle! What do ya think?