The problem with parts may be less of a problem than it once was. Bill DeShivs recently posted a name and website where most Star parts can be found. That was a great thing for those with Stars.
I've had several Model Bs, a Star Firestar, and 3-4 Firestar Plus . (The little Firestar Plus remains my favorite; unlike the older Stars, they had double-stack alloy frames.)
Here's part of Bill's posting. The link doesn't work, but maybe Bill can give us an updated URL or other reference.
There's also a guy here in the US, but I've misplaced his name, who bought Interarms's inventory from them, when STAR folded.