Oddly I don't seem to have much that is written about the Bean rifles but I know there several "Bean's" who were gunmakers.
There was a Baxter, a James and a Russell Bean in East Tennessee and the Bean rifle is typified by what we commonly call a "Tennessee Rifle".
They built these muzzleloading rifles in the 1870's.
The rest of this is based on my memory of the things I've read about these guns while researching the Tennessee prior to my building one of them.
IMO, the Tennessee Rifle is typically a slender fullstock, iron mounted percussion rifle of .45 caliber or smaller. They were usually plain uncarved rifles without inlays.
Walnut was a common stock wood.
The trigger plates are long and the barrel tangs on these rifles are very long, often extending the full length of the wrist and on occasion extending up to the comb of the stock and some distance down it towards the butt plate.
The barrel tangs often have multiple screws extending down thru the wrist into the trigger plate which greatly strengthens the slender wrist.
The trigger guard is often forged wrought iron with a full or partial curl at the rear of the slender rail behind the trigger loop.
The Butt plate was often sheet stock hammer welded or brazed where the rear face meets the upper tang.
The barrels were straight octagons in form.
The percussion rifles made in Tennessee almost always have a lock with a rounded rear on the lockplate unlike the more pointed German style locks that I used on my Tennessee.
My version of a Tennessee (with an incorrect lock that I wanted to salvage from another build) built with a Pecatonica River pre-carved stock.