[ARCHIVED THREAD] - Iron Sight Question

Posted: 8/4/2014 4:25:19 PM EDT

I have a Bushmaster A1 Upper Receiver with the A1 Carry Handle obviously. I do not like the rear aperture, and I was wondering if I could install a XS Sights CSAT A2 rear aperture?

So the main question is if A1 and A2 rear apertures are interchangeable.

Thanks!