Thanks for the replies, and the advice given is the way I would normally have already gone. However, this case a little different. This is a company that has and does work on a bunch of double guns and I am sure they have someone that knows something about M21's or at least I hope so. I need to get the gun in that person's hands, speak with the authority of knowledge and also know that when I'm told something it's truthful.

Johnpe