Barrel / cylinder clerarance

.006"-.007" is fine for a typical revolver. (S&W, Colt, Ruger Taurus)

Some will not accept anything over .004". They have a hard time finding examples that meet their expectations.

Notice that the feeler gauge blades are oiled ? Keep that gauge in a dry place with no chance for condensation. These are RAW steel and will happily turn themselves into a brown lump.
 
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