I used to have a double barrel CVA 12 GA shotgun. The main springs where so weak, it wouldnt snap the cap. I changed both main springs, seemed to solve the problem. Ended up trading off for a T/C NEW ENGLANDER with a .54 and a 12 ga.barrel. I did order an extra set of springs for stock, still sitting in the gun cabinet. I must have orderd 2 other springs for the lock, a lh sear (?).I also have 2 used nipples. If your interested in the parts,let me know.
I will send them to you for the cost of shipping, they have been in the gun cabinet for 10 + years.