+1 on the Jones underlever. They are really cool.

There are two critical features of a good, vs a not so good, hammer gun, in my opinion. 1. What is the sight picture like at full cock on both barrels? Are the hammer ears distracting? 2. Can both hammers be cocked with one sweep of the trigger-hand thumb? If you must thumb them back independently, that is no good. I have always thought that someone should make a hammer gun that would cock both barrels with just the right hammer.

This William Evans 16b meets those two requirements with easy.
[Linked Image from i.imgur.com]

So does this Cashmore 12b.
[Linked Image from i.imgur.com]

_________
BrentD, (Professor - just for Stan)

[Linked Image from i.imgur.com]