Earlier this week, in response to repeated calls to sever its ties to the NRA, FedEx told Business Insider that "the NRA uses UPS and not FedEx" for shipping from its online store. The comment was part of a larger statement in which the delivery service announced its intention to "provide important, clarifying facts."

And while the NRA's online store confirms that it uses both the US Postal Service and UPS to ship products, the relationship between the gun rights organization and the courier runs much deeper than previously believed.

An internal company document obtained by ThinkProgress reveals that FedEx's decision to stand by the NRA has less to do with shipping NRA-branded merchandise and more to do with shipping guns. The document, ThinkProgress notes, "outlines in great detail precisely how FedEx has secretly agreed to bend its own rules on gun shipments for powerful forces in the gun industry, including all major gun manufacturers and the NRA itself."

A FedEx employee provided the document (labeled “Confidential information. Internal use only") to ThinkProgress on condition of anonymity, citing their concern that sharing the document would result in termination.

According to FedEx's 2018 Service Guide, “[f]irearms must be shipped via FedEx Priority Overnight service,” and handguns will not be transported via FedEx Ground. But FedEx has been selective in how it applies its rules: The document shows that the company brokered a deal with dozens of gun manufacturers and dealers to "woo" the industry away from competitors with lower shipping costs.

“Some customers have been approved for an exception to ship firearms with a 2-day (AM or PM) service,” the document reads. The customers in question are 86 firearms manufacturers and dealers, including such major players as Smith & Wesson, Colt, Glock, SIG Sauer... and the NRA.

Internal FedEx document.

FedEx's confidential policy allows these customers to ship guns at much lower costs, allowing it to maintain an advantage over its competitors. A source who spoke to ThinkProgress said "the exceptions to FedEx’s handgun policy started within the last five years in response to increased competition from UPS."

ThinkProgress obtained the document shortly after FedEx publicly declined to end discounts for NRA members, arguing that to end member discounts would be discriminatory, even if it disagrees with the organization's policy positions.

“FedEx is a common carrier under Federal law and therefore does not and will not deny service or discriminate against any legal entity regardless of their policy positions or political views,” the statement said. “FedEx has never set or changed rates for any of our millions of customers around the world in response to their politics, beliefs or positions on issues.”

Commentators on both sides of the aisle weighed in on the news.

And they may just pay a steep price:

Several major companies have already cut ties with the NRA in response to the backlash following a mass shooting in Parkland, Florida earlier this month which left 17 people dead. The list of companies that have dropped NRA deals thus far is as follows:

Delta Airlines, which stopped offering discounted rates to NRA members

United Airlines, which stopped offering discounted flights for NRA members traveling to their annual meeting

Enterprise Holdings, the parent company of car rental brands Enterprise, Alamo and National, which will end discount deals with the NRA in a few weeks

Hertz, which will end discounted car rentals to NRA members

Avis and Budget, which will end discounted car rentals to NRA members

Symantec, which will end discounts for NRA members on its LifeLock identity theft protection service for businesses and its Norton anti-virus software

TrueCar, which is ending a deal with NRA members that allowed them to save an average of nearly $3,400 off the retail price of new and used vehicles

MetLife, which ended a deal which provided NRA members with discounted auto and home policies

SimpliSafe, which offered special promotions to NRA members on its home security systems

First National Bank of Omaha, which terminated an NRA-branded Visa credit card

In a statement, the NRA criticized these companies, calling their decision to end ties a shameful display of political and civic cowardice."

"Let it be absolutely clear. The loss of a discount will neither scare nor distract one single NRA member from our mission to stand and defend the individual freedoms that have always made America the greatest nation in the world," the statement reads.

FedEx has not responded to requests for comment.