The Park is still open for another couple of weeks, but the staff is mostly gone (back to school).  As I say this I'm reminded of why we haven't made it there yet…..Tourist Season.  The photos I've seen in the past seem to show the docents in Civil War era uniform and gear so you're probably right about no breechloaders.  Even though it was garrisoned in the late '60s and 1870, the presence off only one company and only 4800 rounds of ammunition as you've shown, would hardly warrant a fully equipped garrison with the latest rifles.  Still, it looks like there has been a lot of nice work done to preserve the facilities.  Thanks for the reference material.