Someone mentioned a Beretta Blackwing as a lightweight alternative. There is also a Whitewing that is basically the same gun with different cosmetics.
I shoot one of these in 20ga. 686 frame and as mentioned, no rib between barrels. Furniture is not impressive and engraving is not pretty but I'm more about function. It's so light it almost feels ridiculous. However, it fits me so well that recoil is not a problem. I recommend the Berettas.
