Kappa,
I will second AyA shotguns.
I have a #4/53 boxlock with that was made to my measurements.
The barrels are the length I wanted and are choked to my specifications.
I have used this gun to shoot all manner of winged game. Pheasants, quail, grouse, woodcock, doves, pigeons, ducks and even a few canada geese.
I ordered this gun to be built back in 1999 through Fieldsport in Michigan. With the fitting and all it was right at $2500. Never have I regretted doing it.