How about the left handed 1903 Springfields a very close look shows in certain scenes in the PACIFIC mini series?
OR the "left handed" M14 used in some shots in "Skull Island"??
I don't understand how it could happen today, but in the old days, a lot of pictured "left handed" items were simply the result of the negative being reversed and printed that way.
Like seeing a picture of a WWII tank with the bow machinegun on the wrong side.
There is a (relatively) modern error of this type in the CGI image of two rows of Panzer III tanks in "Enemy at the Gates". The tanks are parked facing each other, one side is good, the other is the obvious (to me, anyway) mirror image.