I'm familiar with the Norgon as I had some back in the day when they first came out.

I'm familiar with the Troy as there is one on my Lage M11 5.56 upper. I've heard concerns about if pivoting on and wearing the outside of the receiver. However, as far as I can tel this is primarily a cosmetic issue. If it is really jsut cosmetic then I'm not too worried about it.

I also see that there is one by strike but I know nothing about it.

It looks like there is one by battle steel as well again I know nothing about this one.

What are your suggestions and why?

Thanks.

TED