The stock on the winning entry has been replaced with a hunting style aftermarket style but it is/was a Enfield rifle.
For a bit of contrast I'm attaching a picture of my Royal Enfield G5 with a reproduction of a 1853, Enfield, "3 band" rifled musket sitting on it.
This gun was made in the 1980's by Parker Hale in Birmingham, England, using the original Enfield gauges. All parts are interchangeable with the original 160 year old guns parts.
The Enfield rifles at that time were .577 caliber muzzleloaders shooting a 550+ grain weight, hollow based bullet.
They were used extensively by the Confederates during the American Civil War.
The South had very little manufacturing at the time but they did have tons of cotton. The British were more than happy to supply Enfields in trade for the cotton.
(Of course, getting the guns and cotton past the Union blockade on the Southern ports wasn't easy but tens of thousands of Enfields were delivered.
The Union also bought thousands of Enfields from the British.
The idea was, if the Union bought them, the South wouldn't get them so, many of them remained unused by the North.