You still looking for info on the AL2 ? I've got one, love it, what do you want to know?
Ebay has parts from time to time, including barrels, which are interchangeable with both a Browning B80 and a Beretta 301 / 302 / 303 if I remember correctly.
I havent found what the receiver parts are interchangeable, but I suspect the browning might be the closest.
About 10 years ago I got a custom stock from Great american gunstocks in Yuba City California ( Gunstocks.com ) My trap scores went from 18 straight to 49 with that Beretta overnight.
As I recall it was a return from somebody who didnt want it or ordered the wrong model or something, I believe it was about 90% finished and I got it for about $250 or $300, which was kind of alot to spend on a field gun, but now that it's on I wouldn't trade it for the world. Being able to make a first time - every time hit is easily worth that much. It's a AA English Walnut , with adjustable comb and morgan plate, and looks amazing.
I read somewhere that you should keep a spare connecting rod / recoil rod on hand because it breaks first, and these come up from time to time on ebay for $75, but I figure if that ever breaks I'll just move on to a more modern gun.
Good luck with parts, I bought some spares years ago and haven't needed em, ever. even after turning it into a trap gun and putting thousands of rounds through it.