The Kirst conversion cylinders for the 1858 Remington Revolvers are very close to the original design that Remington used during the late 1860's & early 1870's.
The reason that the cylinder only allowes 5 shots & a dead spot is because of the rim size of the .45 Colt round like the old .46 Remington or .44 Colt is just slightly too large to allow 6 rounds to be loaded into the cylinder with the chambers straight bored like the Kirst & original conversions are.
The R&D conversion cylinders are Bored at a 5/8 of one degree to allow the 6th chamber to be loaded with a live .45 Colt cartridge & is Mr. Howell's patented design.
The Gated setup that Kirst offers is nice but was never done by Remington & does require some modification to the revolver to make the gate work like it's supposed to.
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