I have one barrel without a step, a 10” 357 Herrett, it works on the frames I’ve tried it on except the SSK 50. I’m fond of the 10” barrels too but my favorites are the 12” Hunter barrels. I don’t have any of the very early frames, but I do have a couple with 4 digit numbers. I much prefer the pre easy open frames, I think the triggers are a little bit better as a general rule.
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