Or is there this little thing called inalienable Rights that we are all supposed to have eqaully?
His property. My property. Never the twain shall meet.
Will Rogers once said, "Your right to swing your fist ends at my nose." Your right to bear arms ends at my property line. You only bear them across that line by my agreement. Assuming I don't compel you or trick you to agree, you have agreed of your own free will to abide by this contract. You are morally obligated to do so, and I am morally free to enforce it.
Completely subjugating someone (since you are using reductio ad adsurdum) is a violation of that freely entered contract. If you can find instances of where an employer in the US demanded employees to show up unarmed, and then cast them into chains and forced labor, please produce them. I am sure the local D.A. will be interested.
On the other hand, I bet I could dig up some instances where a property owner legally shot and killed an armed intruder. Which is what you would be if you exercised your RKBA on his property without his permission.
No problem then. Stay home or in your car on the public street with your gun, and Mr. Employer can hire someone else to make widgets. Then, you'll both have what you want.