I talked to Benelli USA on Thursday (4 days ago). They were expecting the first deliveries to them to arrive soon.
That means no Stoeger XS20 Suppressor models have yet reached US dealers, so there's unlikely to be an answer to your question for some days yet. We have them on order - of course - and I'll be giving my impressions as soon as they arrive.
Archer Airguns Inc.
Online stores http://www.archerairguns.com