All right, from a mechanical point of view a properly fitted, and I stress properly fitted Brown rotary bolt is attractive. Simply this. It holds the barrels down towards the frame while holding the barrels back against the breach. Self adjusts for wear and is a very simple mechanism. Double underlugs hold the barrels to the frame nicely. The holding to the breach is a function of the fore end I think. A cross bolt would work much the same as the rotary bolt. Needs a lot more fitting than the Brown patent. A double underlug with crossbolt such as a Merkel SXS is just overkill. either method would be more than fine. Lots of low enders work just great with a inclined slot on the barrel extension, lots of them.
In practice all work just fine. Clean the pin, lube the pin, shoot the gun!
Chief
