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COA is exclusive to Glock for one year, and it mounts an optic that is not competition oriented.

The number of times my optics hit the ground is high enough that I'm not keeping the count. I have not broken one that way.

 

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I'm still rocking GI sights on most of my 1911s. Is something wrong with me?

Depends. Are you rocking them or are you seeing them when aiming?

 

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You made me listen to this guy but appears that they could the same or interchangeable. At the minimum they share a feature of a dovetail for rear sight