Hi Ray

I probably have the same SBE 3 you have. It’s the 11252 20G 24” Barrel.

I was at NWTF this year and I saw that shotgun with the Vortex Viper. I asked the Benelli rep at the Benelli booth could I do that with my 20. His answer was that they had worked with Vortex and they said it could be ran with just the two back screws.

I called Benelli support yesterday and they said the same thing.

I run the Viper on all my shotguns.

Hope this helps.