Steve Rose

Yes, after machining for the tube the remaining barrel wall thickness needs to be at minimum 0.015”. This translates to an OD of .845” or larger for Rem-Choke tubes, .825” for standard Tru-Choke tubes or .805” for Tru-Choke “Thinwall” tubes (but Thinwall tubes are generally recommended for lead shot, target velocity loads only). If your 13/16" is exact measurement then "Thinwall" tubes are your only option....but check that OD with a good dial caliper or micrometer. Another .013" or so may open more possibility. Steve Rose Rose Action Sports, LLC http://www.roseactionsports.com

What is the outside diameter of your barrel at the muzzle?

Somewhere in the evolution of the SBE and SBE II the ejector was re-designed and the shape of the rib was changed too.

That grip cap can come out when the stock it twisted too much (or shot through the wrist area....long story LOL). The part is not listed as an available part from any of the suppliers which leads me to believe it is considered a part of the stock body. A call to Benelli's customer service might turn up a new part.

Surefire once made a forearm with a light, but it may be discontinued. Freedom Fighter Tactical has a made is USA forearm that is a similar style to the factory design.

I resemble that remark!