[williamthewolf]

hmm. well you can order the plastic cases on eBay or gun broker. ...

back straps on hkparts.net. here's the link: HK 45 Parts just scroll down.. they are there, as well as mags.

You can also download the manual in .pdf form here: http://binaries.concealedcarryforum.com/hk45.pdf don't know where you can find an original hardcopy though.

Hope this helps.