No model 1873 or later was converted from a muzzle loader. The Model 1865 (.58 rimfire) was almost all rifle musket, with the addition of the breechblock to the existing barrel. The Model 1866, in .50-70 CF was also a conversion, with the barrel sleeved to .50, and a screwed on breechblock base. The Model 1868 still used many musket parts, but had a new receiver into which the barrel screwed, and most barrels were new. It was also in .50-70. The Model 1870 was slightly improved, but still in .50-70 caliber. It used musket locks and altered hammers.
The Model 1873, in .45 caliber celery sticks, was totally new, using no rifle musket parts.
Jim
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