I also think that any sheet metal you can bend, your rifle's recoil can bend.
The beauty is, the fact that you can bend it means you can match it to the receiver of the rifle. It works in esence like a screw clamp. Have you ever used a screw clamp to secure a radiator hose? You can bend a screw clamp with your bare hands, until you screw it around something cylindrical. Then you can't beat it off with a 10 lb maul unless you damage the object it is clamped to.
I bet this works, though I'm a bit of a purist when it comes to C&R guns. I'd rather have a good iron sight system. Note I said a GOOD system, not the standard Nagant or even mauser sights. I prefer aperatures.