I have had a BSS Sporter for 30 years now in 20 gauge with 26" IC/MOD. It's a little heavy for a 20 but a great field gun. The Beretta 471's I have handled all were very heavy for a 20 gauge so I have never purchased one.
The BSS's do come in various configurations, first ones with NSST and later ones with SST Made in Japan. Later ones had parts Made in Korea and finished in Japan and so marked. Mine is a Japan gun, SST and a very fine product in an original correct Browning hardcase in 99%. I could be induced to sell because I really have no use for it any more.-Dick