29 stores including Walmart and Nike were graded on their gun-safety policies - and more than half of them failed

Walmart: A (90 points)

7 Eleven: F (20 points)

Kroger: A (95 points)

Ace Hardware: F (20)

Amazon: B (80 points)

Applebee's: F (20 points)

Barnes & Noble: F (20 points)

Starbucks: B (80 points)

Whole Foods: B (80 points)

Waffle House: C (70 points)

Costco: B (80 points)

Chick-fil-A: F (45 points)

Buffalo Wild Wings: D (60 points)

Dollar Tree: F (20 points)

Kohl's: F (20 points)

McDonald's: F (35 points)

Dunkin': F (45 points)

Home Depot: F (0 points)

Hot Topic: F (20 points)

Jos A. Bank: F (20 points)

Lowe's: F (0 points)

Nike: F (10 points)

Old Navy: A (90 points)

Nordstrom: B (80 points)

Old Chicago Pizza: F (20 points)

Rainbow: F (20 points)

TJ Maxx: D (65 points)

Target: B (80 points)

Trader Joe's: B (80 points)