Yes, answered my thoughts entirely, Thanks for posting the CVA file....Mr AntiqueSledMan
My rifle is the Mountain Rifle percussion .50 caliber 32"x15/16", 1:66 twist.
I bought two of the kits, sold one to my hunting buddy at cost seems at less than $75 each. I picked them out of a whiskey barrel full that a wholesale has just put out for sale. I kept the one with barrel serial number 000700 and sold him the one with 0007XX. in late 1975. We completed them and started shooting them over snow to see any unburned powder residue to find the best load, we settled on 100 Grains of Goex FFG, with a patched cast lead ball. around 30 rounds both failed to fire, didn't bust the caps, checked and both hammer springs were weak. I contacted CVA and received two new springs in a couple of days. I replaced them and since then we neither one had a firing nor accuracy problem from either gun. I haven't shot mine since about 1995, just clean and oil it a couple of times per year. The bore is still bright and has good crisp rifleings.
My friend died last November at 84.