Looking at the Pietta site to see what's in it, apparently the Mainspring, hammer, hand assy, bolt, trig/bolt spring and trigger. For $17.99, I'm going to get a few from Cabela's. Those parts, from Uberti or Cimarron (for Uberti) would total $59.00, from VTI, $69.00. The Pietta parts are cheaper than Uberti, but not that much cheaper. As I'm shooting my Piettas with R&D conversions in them, spare parts could be a good investment.