I think the ring idea sounds pretty cool but obviously all one would have to do is steal the ring. Also you would need one for every gun you own. Some people would look really silly with all those rings.

Also what happens when they forget which ring is which.
It all just sounds like the gun manufactuers way of trying to appease anti-gun people. It has nothing to do with the mark. Honestly I don't know why people get so worked up over it all the time. They usually start to lose sight of what we are supposed to be doing for the LORD. The bible tells us that we will know and that we can not be fooled by the devil and his "wonders". If anything it should spur people to get to work and be prepared for the LORD's return. "Packing your bags" for the trip would be going about spreading the word and and living for the LORD. That's all we should be doing and worrying about.