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View Full Version : Rear sight aperture "bowl" on AR-15


MMcfpd
November 21, 2009, 06:48 PM
I could conjure up some explanation - probably having something to do with gathering light I suppose, but I'd rather see if anybody does really know.

What is the purpose of the "bowl" surrounding the aperture on most AR rear sights?
http://i150.photobucket.com/albums/s95/MMcfpd/A1_sight.jpg

I've seen them mounted both facing the shooter and opposite. That makes me think there are quite a few people that don't know its purpose.

Slamfire
November 21, 2009, 08:31 PM
Rear aperature holes have sharp edges. I assume the countersink is to reduce reflected light.

olyinaz
November 21, 2009, 11:08 PM
Less area inside the hole to fill with crud as well.

Oly

444
November 21, 2009, 11:12 PM
That "bowl" is perfect to fill up with water when you are shooting in the rain.


I realize that it is vertical when you are firing, doesn't matter. A big drop of water hits there and stays there.

Casimer
November 22, 2009, 12:03 AM
I think that it's primarily to reduce the length of the peep hole. So your sight image is less likely to be affected by the angle of your eye.