Ive always wanted a good replica of a circa 1860 Whitworth. IT was a British weapon used by the Confederacy as a sniper weapon. From what I understand they were very accurate. It was a .45cal
Actually James Whitworth that designed the weapon for the British Army after the Crimean War was a pretty cool engineer, he invented the standard for screw threads 'BSW' which was in use before metric systems. I've often had to get nuts and bolts tapped to 'Whitworth' specs to repair some old items that you can't get off the shelf anymore. I had an old Premier snare drum that I eventually had to ditch because it had 'Whitworth' lugs and I could no longer get spares for it easily.
The gun he designed was rejected by the British Army for being too expensive to mass produce and suffered some durability issues due to the rifling design which was the thing that made it so accurate, but the French army picked it up and that is probably the biggest source of the rifles used by the Confederates.