Sunday's attack at a Tennessee Waffle House left four dead and injured numerous others.
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Shaw's actions are credited with saving numerous lives after officials said the suspect, clothed in only a green jacket, opened fire with an AR-15 rifle.
Authorities say Shaw snatched the weapon away from the gunman. He calls it a "selfish" act of self-preservation and he doesn't consider himself a hero. But he says he's glad he could save other lives.
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The 29-year-old man said he made a split-second decision to challenge the suspect early Sunday at a Nashville Waffle House. He was able to get the gun and throw it over a counter, adding, "it was hot, but I didn't care. It was life or death."
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Shaw set out to raise money for the victims and was hoping to raise $15,000 on GoFundMe.
At last check, people had donated more than $160,000.
Click here if you'd like to make a donation to help the victims' families.
The Associated Press contributed to this report.