The ASE Series represents the finest O/U's Beretta ever built with the exception of the SO's. The barrels for SO's & ASE's can generally be fitted to each other, and many of the ASE barrels were of the Boehler antitint Steel.
I said all of that to say this - Rich Cole is the only person that should work on that level of gun. At one time he was the only factory bench trained gunsmith for SO's in this country. He has worked on my SO's & ASE's for many years without ever a glitch. There may be other guys capable, but no high end Beretta of mine or of any of my customers will ever go to anyone but Rich Cole.
AS they say, just my opinion.
Hack