Pretty sure Benelli already makes 20ga auto’s. M2, legacy, Ethos, and more but these are the ones I can just think of right now without checking there line up. As for a SBE version in 20ga not sure if that makes sense as the SBE designation goes to there 12ga 3.5” auto, not sure if any ammo manufacturers are making 3.5” 20ga shells at this time, but I could be wrong. Anyways a Benelli M2 in 20ga is pretty much a SBE II without the 3.5” chamber. As for the original posters question, I have heard the Browning is not making a 20ga version of the A5 as they believe it will take sales away from the sweet 16 and they are really trying to push that model. If Browning discontinued the 16ga version you can bet a 20ga model would be just around the corner.