I've owned on for quite some time - using smokeless factory loads, and it's a strong, accurate weapon
A surprising number of original parts were used by Harrington and Richardson in construction of their rifles - purchased from S&S Firearms and W. Stokes Kirk, to name but two suppliers, and at that time - Trapdoor parts were amazingly common.
I've never heard of any failure, whatsoever.
I 'had' heard that they were in demand by Davide Pedersoli when that firm decided to produce that model - though I can't put my finger on the data.
The thought was that the very 'early' Pedersoli offerings were re-worked H&R's.
The Model 1875 Officer's Rifle originally featured the model of rifle sight and base that was then-current when it was purchased - quite often the Model 1879 sight - but it could be the earlier one as well.
It was also fitted with a Beach Combination folding front sight - the type with the little bead atop the round sight guard.
The vernier tang sight was also graduated.
The H&R has none of the barrel-mounted rear sights - and has a post front.
Both can be replaced easily - though finding a very 'clean' Model 1879 Rifle rear sight may be difficult.
I'd happened to have one - so...
Installation is straightforward, should you so choose - drilling and tapping was how Springfield Armory did it, so you can, as well.
The thing is - 'if' you do mount the rear sight - the bottom of the sight base will occlude the very top of the lettering found on the barrel.
You may or may not want that.
As to the vernier tang - you can scribe your own gradiations, as was done from time to time.
These H&R Officer's Rifles are rising rapidly in value - so if yours is priced reasonably - getting it is a good idea.
As to answering the 'Battle Rifle' question - someone else will have to say yea or nay, since it was designed as a 'sporting' rifle for private sales to Officers - and not as a 'battle' rifle by any stretch of the imagination.
The barrel measures 26", while that of the standard rifle was 32".
Vaya,
Scouts Out!