Your criteria seems pretty easily filled. But, I can't tell whether you have a budget of $1000 or $70,000 from what you posted.
Just check out GunsInternational.com for literally hundreds of gun in 20ga that may fit your criteria.
Sorry, I missed the O/U criteria.
You might consider getting a Superlight Superposed and having Art's Gunshop convert it to double triggers. But only a Superlight will be under 6 lbs in my experience and it'll be hard to find longer than 26 1/2" bbls.
Last edited by Chuck H; 02/13/13 02:30 PM.
