About the guns. This is one museum that is a MUST SEE for me.
“American’s Cannon Factory”
http://www.globalsecurity.org/military/facility/watervliet.htm
http://www.wva.army.mil/Index.php
http://en.wikipedia.org/wiki/Watervliet_Arsenal
http://pdfhost.focus.nps.gov/docs/NHLS/Photos/66000503.pdf
http://pdfhost.focus.nps.gov/docs/NHLS/Text/66000503.pdf
Pic on page three of the first PDF file is must see.
More on the rifles.
http://www.navweaps.com/Weapons/WNUS_16-50_mk7.htm
http://en.wikipedia.org/wiki/Washington_Navy_Yard