You may need to know this - FAB Defense Top Mounted Deployable Front and Rear Sight for Right Hand

I got these to put on my 3 gun rig. My plan was to add a Blitzkrieg Chevron front sight, but the sight post on these sights is not replaceable. That may be a deal breaker for some...it was for me. That being said, they seem well made and durable. I was tempted to keep them for future projects but decided they were too expensive to live in a box and potentially never be used...