Does this issue happen on every chamber?and also ,when you actually pull the trigger,does the cylinder then lock up fully?Also,does this happen just when you cycle the action very slowly or does it dissapear with normal cocking?
I have a colt python that does this on 2 of the 6 chambers when cycled very slowly,but this dissapears when you #### the hammer normaly,as if you are shooting on the range.The cylinder always locks up fully when the trigger is pulled,and the "secondary" hand moves the cylinder ever so slightly so the bolt drops into the cylinder slot.This really bugged me a lot initially,but after doing alot of reading on the subject,I came to the conclusion that it is quite common on colts and is usually a non-issue.As long as your gun isnt spitting lead and is accurate,it should be fine
Colt revolversmiths are few and far between(even in the US)and few smiths understand Colt timing etc.I found a great book to get is Jerry Kunhausens book on Colt revolvers,theres alot of info there on how Colts work.
Another thing you may want to read is the Colt forum,there is some good posts there on checking colt timing
I really like my colts,but without a doubt,they wont stand up to the same amount of shooting as say a ruger.I tend to baby them,shooting only light loads and avoiding being hard on the action(eg really rapid fire DA)