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This was a breech-load design invented by the British during the ARW. With its breech load design it could fire 6-10 shots a minute vs 3-4 that would continue to be the average rate into the ACW.
The British at the time didn't have the infrastructure to produce them in any significant numbers however the Union Army of the 1860's would have had a significant edge in manufacturing ability.
What if the Union had adopted this rifle design? How would have that effected the war?