http://www.charlotteobserver.com/news/politics-government/article200241689.html
NRA groups spent nearly $7 million on behalf of Burr. That includes $5.6 million that NRA groups spent in 2016 against his Democratic opponent, Deborah Ross. That was more than the NRA spent against any 2016 candidate with the exception of Hillary Clinton.
And Tillis had gotten $4.5 million in help, including independent expenditures against his 2014 opponent, then-incumbent Democrat Kay Hagan.