A Lefever Arms Co has a single top wedge bolt in a square shouldered doll's head. A Parker Bros V & up has a single under bolt & a square shouldered doll's head, the trojan lacks the doll's head. A Win 21 has a single under bolt A L C Smith, Ithaca NID & A H.Fox have a single top Rotary bolt. Bakers normally have a single top wedge bolt in a straight rib extension. The Ithaca Flues has an under bolt plus a top bolt & it's not as strong as any of the above.
Note also the doll's head of the Lefever & Parker does nothing to hold the barrels shu, the single bolt does that.
All the BallyHoo over multiple bolting is almost always directed toward keeping the barrels bolted down so0 they don't revolve open, this is NOT the major stress point in handling the load being fired.
"ONE" good solid bolt will hold any gun shut.
If you smoke test the fit on most any except perhaps the Very, Very High Priced ones (I don't have any in that class to test) you will generally find that regardless of how many bolts the gun has, generally one is doing all the work.
