Thanks for the response Patrick. I was at the NMLRA shoot for a couple of days. I looked up a friend of mine and asked if he had any Rolling block parts. He thinks he has everything I need to put the RB together.

The barrel measures 36 inches long total. when I screw it into the action it's 34 and 1/2 inches. I had compared the barrel against an Army model and a navy model. Both of those barrels were shorter than mine.

The bore is 50 cal. so It's a 50/70.

Here is a pic of the front sight. There is no bayonet lug.