Thanks Red Leg.
The rifle weighs 10.5 lbs, and I think you are right re the stock and pad. According to Wal Winfer's Army and Navy falling block rifle records, there were 19 rifles chambered for the .500 NE and 17 rifles in .577. 37 rifles were chambered in .450 3/1/4, 5 rifles in 450 No. 2, and...