I have three Uberti's that had the same problem, a 1849 Pocket, 1862 Police, and a Pocket Navy. Replacement nipples helped slightly, but never could fire five shots without multiple cap jams. I replaced the main springs with ones made for a Pietta 1851 Navy. Ground them down to size, and cap jam problems went away. My little Uberti's are now fun to shoot. Still not pleased with Uberti, for the price I paid, I shouldn't have to have the additional cost of replacement parts and then tweak a brand new gun just to get it to function properly. I would never buy another small Uberti. No problems with either Uberti or Pietta when it comes to full size revolvers, they run fine for me right out of the box.