First, welcome to the forum. Second, welcome to the world of wheel guns. I hope this is the first of many for you. I might add to the above comment, the 642 is a DAO model, so you need a trigger pull to cock and remove the block. Probably some more technical explanations will be along shortly. I carry the scandium alloy version of the same gun in a Mike's pocket liner... and have for years. I can't tell you how many times I dropped the gun moving it from one place to another. No AD's.

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Randy
Provenance nerd