There's a wealth of great information and how-to's on the 3000 in this section but a significant amount of that info is buried in some long threads. It's important enough (at least to me:) that I'd like to start a thread that's a condensed version of specific upgrades, replacements parts, mods, and observations in this particular thread. If anyone has a link and/or brief explanation of an upgrade, upgrade part, after markets pat(s), or mod for this shotgun please post it in this thread.
Benelli Extractor (drop-in replacement for the OEM Stoeger Extractor)
http://www.brownells.com/shotgun-parts/receiver-action-parts/extractor-parts/extractors/extractor-prod6222.aspx
Benelli Extractor Spring
http://www.brownells.com/shotgun-parts/receiver-action-parts/extractor-parts/extractor-springs/extractor-spring-prod23642.aspx