FWIW, these are the gaps I measure on some of my revolvers:
0.001 Uberti 1858 Remington NMA
0.001 Ruger Single Six .22 LR
0.002 Ruger Old Army
0.003 Ruger Blackhawk .357 Mag
The cylinder free spins easily on ALL four revolvers. The Uberti, ROA, and the Blackhawk free spin slicker than snot on a doorknob. The Ruger SS free spins maybe three rotations and not nearly as easily as the other three.
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