Anyone out there who has a Benelli Super Black Eagle 2 knows that it is borderline impossible to find a sling that fits. The issue is that Benelli doesn't make a sling for it and the only notches on the gun for a sling are very small.
After 2 years of searching, purchasing and returning, I finally stumbled across Quake's Rifle sling aptly called "The Claw". In additional to coming in several finishes and being well built - it's cheap!
It clips on very easily by pushing in the button underneath the notch at the top. Then simply move the hook through your sling loop and release the button.
You can find it on Amazon (link) for less than $20.