Leonard, since you haven't specified the particular pistol, I would try contacting the manufacturer for a parts list/parts. If they are outside the US and are imported, there usually is a US based importer/distributor that may be able to direct you to parts supply.

if you re-post with details on the guns (model and make) I may be able to give you more help but as of now all I can advise is contact the manufacturer and ask them for the parts breakdown list and the 2nd way is check out numrich arms they have many gun parts lists on their web site gunpartscorp.com/

Leonard, And what fine firearm might that be that you own three of. If nothing else keep 2 running by cannibalizing the third and get that one up and running as a project when you can get parts???