Bummer.
I've not run across a Beretta single trigger that couldn't be made to work by the time honored soak and air blast that you've already done, but my experience is only with O/U types.
Beretta is infamous for wood chips from their machine inletting process floating around and jamming things up. I've had this happen with 3 Beretta O/U's that I've owned and heard about many others.
Did you try it for function (trip left, bounce the back of the frame on a piece of carpet, trip right) with the stock off?
That's all I can suggest without having the gun in my hand. Look for inletting residue.
You could hunt with it. The barrel selector is pretty handy to your thumb... just get your thumb out from behind the top lever before you shoot the second barrel.
I never did try bumping it with the stock off. Since I could push the block back with my fingers and that didn't change anything, I thought something I couldn't see must be broken. But as I said, my local gunsmith has it now and I will just have to wait until he examines it before I can do anything now. He seemed very confident that he could fix it, and has never let me down yet. He has done 5 or 6 trigger jobs on shotguns for me and did a superb job every time.
I am so glad to get the information here that there are 626 guns in Europe that have DT. That makes me think that somewhere in the world the parts that I need do exist. Am I wrong in assuming that a trigger assembly would not require all of the legal issues associated with importing a gun? It wouldn't be called a gun in the USA, but I don't know if that's the case in Europe.
