Don't know if it is standard for S&W, but the right to left fact is well documented in various forums.

To keep track of these various "good to know" things, I maintain a directory on my PC which has folders for all of the various makes/models of firearms I own. Every time I stumble across something like this, I do a bit of research to verify it, then toss it into the folder. Next time I need to work, buy parts, etc. for that particular firearm, I check the folder to see if there is anything to be noted.

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Stu