You just said in one paragraph what I've been trying to convey this entire thread! Very well stated.
You do have a fundamental right to own any firearm you legitimately acquire, granted. You do not have a fundamental right to employment by any person or company who, for whatever reason, does not want you as an employee. If a company were to forbid firearm ownership by all employees and you decided that you'd rather work at that company than own a gun, you would have the right to make such a decision. In so doing, however, you would not be giving up your right to own a gun since you would remain free to, any time you decided you wanted a gun, submit your walking papers, go to an FFL, and buy one.