Omar Mateen, the shooter who killed 49 people in the Orlando nightclub Pulse on Sunday, used a Sig Sauer MCX assault rifle (it was previously believed that he used an AR-15 semi-automatic rifle), which he purchased legally in Florida. As a security guard, he was licensed to carry a concealed weapon in the state, though you actually don't need a license to buy a Sig Sauer MCX in Florida. And, as evidenced by the video above, it likely wasn't even hard for him to conceal it. 

A video posted by Facebook user Rob Buck on Tuesday shows someone looking completely innocent and then nonchalantly pulling an AR-15—which is of similar shape and size to the Sig Sauer MCX, according to The Washington Post—out of his waistband. "For the conspiracy theorist[s] that say it can't be done," Buck captioned it. 

On top of that, there are kits for sale that let people hide AR-15s in briefcases.

 

Oh, and if that's the only gun you noticed in the initial video, take another look. 

Mateen was also carrying a 9mm handgun. 

Further proving how easy it is to accomplish what Mateen did, Philadelphia Inquirer reporter Helen Ubiñas bought an AR-15 in only seven minutes. 

Buck's video has been shared 3.6 million times, and people are commenting on what this implies about the accessibility of guns in this country. 

Buck did not immediately return Complex's request for comment. 

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