Satterlee offers a left side safety for the right handed bolt for the very good reason that the thumb is there already and so it is the quickest safety to get into action. Mauser put his flag safety on the left for a very good reason.

http://www.satterleearms.com/gunsmithing.htm

I put an extended flag on my custom 7x57 as I also have a scope in QD rings that I carry in a scope bag in cases it is needed.
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Von Gruff.

Exodus 20:1-17

Acts 4:10-12