Side screw broke 1st shot - Burris FastFire Reflex Red-Dot Sight Mounting Plates

Installed this mount on my Ruger Super Redhawk .480, with the Burris Fastfire 3 red dot. First shot at the range, I felt something hit me in the face, which felt like spent brass. I looked at my revolver, and the Fastfire site and mount were gone. Luckily, I found the site a few feet behind me. Turns out, the side attachment screw on the left side of the base broke clean off. I believe it was the screw head I felt hit me in the face. In hindsight, I'm glad it broke on the first shot, before I wasted precious ammo (I can't find .480 Ruger ammo anywhere) sighting it in. I plan to send it back to Optics Planet, and will give it another try, as I really like the way this site looks/feels on this revolver. I am concerned about this Burris Fasfire 3 red dot holding zero now, as it hit the cab of the truck behind me when it flew off the revolver, before then hitting the ground.