I have up for sale a lightly used Nordic Components Benelli Magazine tube extension, with spring.
It's in very good condition, includes the longer magazine spring, and adds five rounds of capacity to your Benelli M1, M2, Super Black Eagle, or Super Black Eagle II. This originally cost $79.95 + shipping from Brownells.
I'll take $45 shipped UPS to your door. Payment via USPS money order or paypal +3%, please.