Shall Not Be Infringed? By Whom?

The problem with claiming rights is who are you claiming rights from?  If it's from the US Constitution, then you are only claiming a right from the Federal Government.  Even then, it is only a baseline right--that is that is the minimum level of protection which states can't violate.
In other words, State constitutions can grant expanded rights, but they cannot restrict the right.  Thus, state constitutions can offer "individual rights" to arms in their constitution while the Federal Constitution explicitly limits the right to a "well-reguilated militia".
But, that is an aside, You do not have rights against private entities.  Go to a Walmart and pass out Union Literature and find out what happens if you think I'm wrong.  In fact, for all you people who dislike the state, realize that non-governmental bodies can tell you to go fuck yourself as far as rights go.
That said, GE Capital, the huge financing arm of General Electric Co., has made it a policy to stop making loans to gun shops:

"As a responsible lender, we regularly review our lending policies and products to meet changing conditions and requirements. In 2008, we adopted a policy to cease providing consumer financing programs to merchants whose primary business is to sell firearms.  Recently, we implemented a more rigorous audit process in our sporting goods segment in light of industry changes, new legislation and tragic events that have caused widespread reexamination of policies on firearms. This process has affected less than 75 retailers (approx. .001% of all gun retailers) and an immaterial part of our sales volume."

The move marks the latest effort by the corporate and investment worlds to take a stand on guns. It could have a significant effect on the powerful and sprawling gun industry if the financing dries up for the firearms industry.
Also, that would also have an effect if people exercise their right NOT to have you armed on their property.
To be quite frank, the "pro-gun" stance isn't very "pro-gun".  People running around armed and irresponsible doesn't place gun owners in a very positive light.
Or as John Lennon said:
"If you go carrying pictures of Chairman Mao, you ain't gonna make it with anyone anyhow."
In this case, those elite people you dislike have realised that money makes the world go around.  And they have the money to make it turn the way they want it to.