I own a square butt 547. Never heard of any issues with regard to function. They were discontinued as they were complex to build in order to get reliable firing and extraction of the rimless rounds and not popular when new. They are surprisingly valuable now and scarce. The snubbie was a moon clip gun and not as mechanically distant as the 547. Function on the 940 should be no different than any other moon clip wheel gun. Dave
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Time Wounds All Heels
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