The rod looks fine to me, maybe, or maybe not original, but it makes little difference one way or an other to the overall value or disireability of the gun.
Interestingly, the rifle doesn't look anything like the Henry Carlile rifles I've seen and handled.
The signature on the barrel is certainly his, and he also had a very distinctive engraving style, but it's hard to tell from the pictures if the engraving on the patchbox is in the style of Carlile. A good close-up pic of the box could answer that question.
Buck, Is your friends gun signed H Carlile as well?
I'm not suggesting that this isn't a Carlile, just that it doesn't look like any that I've seen so far. And had the name not been on the barrel, I would never have considered him as the maker.
None the less, it's a nice looking rifle, and if Carlile did make it, he wouldn't have been the only maker to make guns in two completely different styles.
Thanks for putting up the pictures and letting us take a look!
John