"Edward George Parry used the "Greener" cross-bolt in his guns. In conjunction with his patented "rear acting" under-bolt on his Quality 2 guns"
The rear acting bolt would seemingly serve to help pin the barrels to the breech, a plausible feature. The Baker has cams in the lump and frame to push the barrels back also.
I like the idea in theory of the barrel extension bolting systems as they seem to have the possibility of pinning the barrels to the breech, establishing a true lock. I.e. the Greener, Brown, and Tobin bolting systems.
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