I read somewhere else *cough*cgs*cough* that they were willing and actually did engrave a swastika on a *new*build rifle...
Perhaps atrs can confirm or deny this rumor.
I seem to recall it was an insignia that turned out to be from a SS division. Not a swastika. Still not saying that's good but maybe it wasn't known what it was. I wouldn't have known if I just saw it and it wasn't looked up.