Thanks for the reply. I called dlask and they are no longer making them. As for her as arms I've heard people hate dealing with them and I am having trouble finding a dealer. As for north sylva I have to research that a bit more maybe with some hope that will lead somewhere.
Yeah, I used to work for a gunshop that imported HERA Arms... not fun to deal with, but their stuff was very well made (for the most part... except when they forgot to drill the gas ports in their AR barrels then blame you for not specifying to drill them......)
Saskatoon Gunworks (a sponsor here) looks like they may have some HERA Arms stuff in, might shoot them an Email and see if they are planning on another order anytime.
North Sylva is a big distributor here, they are currently the HK Importer and carry (or can usually get) anything from HK, although you may wait a little while. Any gun shop can order from them, and in this case Wolverine Supplies should be able to get something from them. Wolverine ordered me a bunch of the barrel retaining roll pins, took over 2 years to get them, but they did indeed get them! Something like rail sets might be a little more reasonable to get a hold of.
I guess the bad part is that the USC45 is made in such limited numbers (if not outright discontinued, although HK changes their minds every year about this) that accessories are not very easy to get anymore for them.
In any case, good luck with your search, hopefully you have some places to look into!