Just because you own a lathe, doesn't mean you need to use it.
The Model 1875 Officer's Rifle was a premium weapon during it's period of use, and the ones built by Harrington & Richardson are nice rifles.
If they have a flaw, it's that they didn't mount the original Model 1877 'Rifle' rear sight on them - but you can buy those and mount one yourself - measuring from the receiver.
Some don't like the fact that the rear Vernier sight has no range markings, but if you run the disk's opening down to 3/4" from the bottom of the slide, you'll be set for 100 yards, and you can mark your own from that point on.
Step away from the machine shop, and turn off the lights...
Scouts Out!