HEYM USA, purveyor of fine rifles [I am unlikely to ever afford], offer a front sight for their double rifles that uses a diamond as the bead. Apparently it is a night sight. I have never seen this before.

Anyone know how effective these are?
When the boyz in the hoodz hear about these, the first to offer them as Glock sights will make a fortune 
This is a very clever idea. The rifle is a Mossberg 144LSB Target rifle that is currently listed on gunbroker.

The advantage of having the sight raised is that when shooting from a offhand/verticle position you can keep you head as close to upright as possible to achieve better balance.

Hat Tip: RFC
Apparently it refers to the use of a electronic sight along with backup iron sights. I was aware of the concept but not the word.

A “Co-Witness” AR from eguns.com
Traction Control explains.
… and their use, or lack of use, of iron sights amazes me.
From MilitaryPhotos.com

Palestinian police officers loyal to President Mahmoud Abbas violently dispersed a demonstration against the Annapolis peace conference, and medical workers said one protester was killed in Hebron, a West Bank city, according to The Associated Press. A Palestinian police officer pointed his weapon at protesters during clashes in Hebron.
In case you did not notice, the above ‘police’ officer is holding the rifle sidewards ‘gangster’ style. Why these soldiers/’police’ officers cannot be taught to aim their full auto AKs is beyond me. I know some people think iron sights are hard but I started shooting with them and to this day still do most of my shooting with iron sights. I think they are easier to use than scopes once you know what to do (obviously depending on the application).
Here are some of those classic Liberian rebel photos



More of the above photos here.