The statistics are as follows:
Halfstock percussion rifle made by Edward Kline, of Henry, Marshall County, Illinois. Kline worked in Henry (Twenty miles from me) from at least as early as 1854 through 1877. Kline was a noted maker of long range target rifles, referred to by him as "eighty-rod guns" in his advertisements, but this one seems to be a round ball hunting rifle, although rifled with gain-twist and drilled & tapped for a tang sight.
Wood: tiger-striped maple
Length overall: 48 3/4"
Barrel length: 32 5/8" including patent breech (hook breech)
Width across flats: 1 1/16" no taper
Caliber: approximately .46, with 8 groove gain-twist rifling
Length of pull: 12 7/8"
Mountings: german silver, except for the very unique hand-forged iron trigger guard (apparently for use with a gloved hand) and poured pewter nosecap
Weight: 10 1/2 lbs.