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Gold Bullet member
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Does one of your pics depict a strap-on periscope? Looks like a second person to the side of the rifle is doing the sighting, but in the picture neither one of them has good cover. They'd have to get that worked out a little better.

Anyway, really nice coollection.

It's a sighting tool to insure that the trainee shooting the rifle is aiming the sights properly. The coach verifies the proper use of the sights by looking in the periscope window on the side.
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