Thought they made two versions of the gun, one a double action for "officers" and a single action for "sgts" and some enlisted. Have never seen a single action but have shot and owned several "officers' guns...
Reportedly this revolver was the gun of choice for Russian international target shooters
How they ever shot well enough to score with the yards of trigger pull is beyond me.
The KGB thought highly of these with a shortened 3" barrel. Used them to kill the Czar and his family says the history books. Or tried to, apparently when they tried to shoot the female family members in the prison basement the .32 rounds bounced off the gold coins and jewlery stuffed in the under clothing...