Rockdoc:
The American firms that were importing Spanish and Italian sxs shotguns in the 1950s-1970s were selling into a market that favored single triggers, pistol or semi-pistol grips, beavertail forends and ventilated ribs. I've seen Berettas, Zolis and a host of Spanish guns by lesser known makers all similarly equipped. They are a product of their time and, at least in my experience, are quite functional. I've owned two - a Beretta GR2 20 gauge (which did have double triggers but otherwise shared all of the era's features) and an Antonio Zoli 20 gauge (which has all of the era's characteristics), which I still have and shoot regularly, even though I also own a number of higher grade British, Italian, French (Darnes) and one Austrian sxs. Shoot it awhile before you take the rasp to the forend. You might find you appreciate the beavertail and don't need to make the change.