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Im seeing quite a few pics in magazines and on the net of those super small red dots mounted at a 45* angle on the side of a sight like a trijicon or similiar.
It seems to have started with the Spec ops guys mounting a red dot on their 3x sights so they could do faster shots when in CQB in the cities.
In my opinion a red dot on an angle would not be super accurate or easy to adjust but for a quick sight picture to get a shot off it would work well in short distances... even better with a shot gun
It's a good idea for close quarters engagement needs.
You can see a lot of those angled mounted red-dots
on race guns that have a magnification optic on top.
You could find these mounts cheep on internet on sites as ebay.
PS It should be mounted on the side of your shooting hand.