Benelli SBE 3 & Briley +6 Extension

I have an unfired Benelli super black eagle 3, 3.5 chamber 28 barrel. Gun has never been assembled. I am also including a new briley carbon fiber magazine tube extension that adds 6 rounds. This should make a stellar goose combo. Asking $1700 may consider trades. Located in Williston but get to New Town often.