We've been working for several months to come up with a mounting system for putting a Docter or RMR type sight on our double rifles.

The primary objectives were:

1) Give our customers with "aging eyes" an easy-to-see alternative to a scope.
2) Minimize modifications of the rifle to accept the mount, i.e.: when the mount is removed, the rifle should look unmolested.
3) Mount the sight as low as possible.

I'm quite pleased with the results, and will get some better photos in the next few days.

In the interim, here is the mount with Trijicon's RMR sight attached.